Have had fascination over the idea to create music from just vocals and have tried sometimes using Melodyne. For me it has not been easy as the things that come up using my head instead of an instrument or sequencer have been far less interesting.

In the end maybe having an instrument at hand to just pick out the notes is easier.
Having said that and maybe leaving the impression of negativity over such an app like this…
​I must say that I like it.

First on my mind was will it work, as there are other apps that have been trying their hands on note recognition but failed miserable. As anyone that tried these apps will tell you, that it is hard to use a garbled mess of random midi notes for anything.

Second was, will the app be used and not just occupying real estate on the phone/tablet?
Feel that yes there is definitively use for it. Maybe for me the first use is to quickly take out music that I am listening to without using an instrument and having the midi notes available for later.  Or use the bassline off a song as a starting point etc.

And yes it actually works! It does find the hummed notes with accuracy and there is some heavy algorithms going on behind the scene as it takes some times to transform the audio into midi, but it works.
There is also the problem of latency that they solved by letting the app listen to the metronome and audio recordings and get adjusted.
I mention these concerns as they are the most important to know if anyone is interested in getting the app.

​There is some setting up and trial and error but not too much and my biggest critique is that it only records two bars for each track but understandably it would be too heavy processing and waiting time otherwise. And for doing a bassline/melody/beat it works out fine.

Hopefully they maybe add a sequencer window that can be used for importing the midi and as such make longer tracks possible piece by piece.

Also feel that they should have a free version with maybe just one track and no saving or similar as even if it is not costing a fortune it is good to test it first just to know how well it performs on whatever device. But there is always possible to test it anyway and return it after an hour or two so it is not a big thing.

So it will be fun to see if I end up using this app or not but in either case I am happy that it is installed and having the possibilities that it offers.

P.s the sounds are General Midi but midi can be exported to use in other apps/programs.

Google Play:
https://play.google.com/store/apps/details?id=com.humbeatz.humbeatz

HumBeatz is the revolutionary music making app that allows you 
to hum, whistle or beatbox and turn it into the musical instrument of 
your choice. Now you can quickly create musical parts and song sketches with just your voice!

HumBeatz is a four track loop recorder with two detection modes, Hum and Beatz. The detection mode translates your recordings to notes which are then played back by the included instruments or drum kits. You can also skip detection and use it as a simple loop recorder.

Hum detection allows you to quickly turn your whistling or humming into one of the over 30 virtual instrument included. Get your ideas out fast and easily anywhere!

Beatz detection translates your beatbox to any of the included drum 
kits! Using our machine learning algorithms you can also teach HumBeatz what types of sounds to use for your beatboxing.

Included with HumBeatz are a variety of drum kits and instruments, two effects (Reverb and Delay), a four-track Mix page and a Teach page.

HumBeatz is an excellent tool for any musician on the go and opens up music creation to everyone.

The developer has made one unique drum machine called Dragon and one Drone synthesizer called Wiisp. This is the latest app and is focused on using the motions sensors in a device for controlling a shitload of parameters.
Each parameter can be controlled by desired amount back n forth and sideways.

It really is worth spending some time with it to get out as much as possible from it.
Think this will appeal to people that are not afraid to take some time to find the sweet spots and some will be confused and run for shelter in more conventional music apps.

Yapps just like his other apps the graphics are bare bones which will scare off some but personally I find appealing, as it fits with the rawness that can be made sound wise.

Google Play:
play.google.com/store/apps/details?id=com.thiiird.fang

Fang is a synth app based on motion modulated control through accelerometer information. Each parameter can be linked to different directions of motion. Contains presets, WAV recording, a stepped arpeggiator with diatonic scale locking, a multi-pattern sequencer, wave shaping oscillators, resonant filter with envelope and pitch following, and an effects rig (including formant (vowel) filter, pitched delay, reverb, down-sample, bit reduction.) Capable of strange sonic textures, complex evolving arpeggios, or classic sequenced synth sounds.

Notes are generated with a sequencer and keyboard. The sequencer works by moving a step at the rate specified. There are four patterns that can be played and edited independently.

The keyboard has a set of notes that can be played or buttons which hold notes. Held notes can be cut off by sequencer notes and play notes of the same pitch.
The arpeggiator receives notes from the sequencer and keyboard. Its rate is controlled by both synced time and ms that are added together. It has variable steps, step transpose and gate. The steps and timing can be reset periodically with the optional arp reset. There is optional diatonic scale locking as well, allowing you to select a root note and scale from major, dorian, phyrygian, lydian, mixolydian, minor, and locrian.

The synth's sounds are generated with five voices, each with two oscillators that modulate between triangle and saw. Modulation is effected by an envelope. There is a pitch envelope that effects both oscillators. The oscillators are capable of fm (osc B modifying osc A.) Both oscillators can have their signals sent to the filter or directly to the amp envelope. A white noise signal can also be added to the filter or directly to the amp envelope.

The filter is a 4 pole resonant band-pass whose frequency can follow the pitch. It is also effected by its own ADSR envelope. The filtered and unfiltered signal is sent to a per voice down sample and per voice delay under synth menu. All voices are sent to an effect rig with a formant (vowel) filter, pitched delay, reverb, and bit reduction. Presets and WAV files are stored at /device root/fang/.


Four sub parameters for each parameter to adjust left, right, back, and forward accelerometer input
Save and load presets
Export audio as WAV (exported to /device root/fang/)

4 pattern 8 step sequencer with adjustable rate
Stepped arpeggiator with sync and ms rate control
Diatonic scale lock

5 voice polyphony
Pitch envelope
2 oscillators wave shape between triangle and saw by slider and by an envelope
Oscillator B to A frequency modulation (fm)
White noise generator
Per voice delay
Per voice down-sample effect

4 pole resonant band-pass filter with frequency control by slider, pitch, and ADSR envelope 
Amplitude controlled by ADSR envelope, number box, and pitch

Reverb
Formant (vowel) filter
Delay with re-pitched feedback
Bit reduction


File permission is for presets and WAV recording. Would love to hear anything made with Fang, email is posted.

The new update of Noise Machine is not the biggest but an interesting one.

To pay for the premium version you do to get rid of the ever so annoying publicity that are a regular feature of many free apps but it also gives access to a sequencer.

If this would have been a more standard music app it would not have been too exciting, but Noise machine being focused on getting synthesized noise out of it. Being able to set different types of noisy oscillators, Lfo (different types) modulation, filter, delay and distorted ring modulation it can bring forth a whole lot of different flavors of noise.

This may not be obvious at first glance as the interface appears simple but rewards tweaking, with all kinds of goodness for musicians that are willing to step out of the comfort zone of commonly accepted norms.

Ahh so back to the sequencer… It is a simple sequencer but very useful as each of the sixteen steps can be programmed with one setting of noise. Making it possible to build rhythms of noise that would be hard to achieve without much more work in other ways.
There is also the added bonus of randomization of each step for the lazy ones. Giving way to unexpected surprises of course.

There is griones, always griones knocking at the door of perfection!

The most obvious one being that there is no way to save the sequenced pattern steps. So once the app is turned off… But it comes with internal recording for further chopping in an audio editor or for importing into other apps/programs.

Another thing that could be nice is to be able to see what Bpm the sequencer is set to.
So that is something that has to be set by ear or retro fitted later into wherever the recordings go later, if wanting to use it within music set to a specific beat.

Would love to see this concept taken farther with more tracks, effects etc as it is unique to be able to noise things up on an even deeper level!
Maybe the closest to (but not limited to noise generation) that is Grainstorm which I also recommend to check out. Grainstorm can also load sounds so it is a nice companion to Noise machine…

Have nothing against Mixvibes that released the application as they are making quality apps but...
Have never liked the loop based music making that is pervading electronic music making.
Buy some packs and sound like this, just put one loop together with some other loops in the style of... Ahh yes forgot the creative part... here we have put some fx to create originality...
Ohhh listen as the filter sweeps on a loop or two and as a delay trail down another sound and there it is, another song made that brings absolutely nothing to the table except an empty ego boost!

Maybe it is on my mind lately as my brother just started making music with such an app.
He is super excited showing me the music he is "making" and it sounds well produced but it brings absolutely no excitment or anything that resembles originality in any way form or shape.
The worst thing is that he is a pretty decent guitar player and knows some music theory etc. 

As popular music gets more and more mediocre for each passing year (this have been studied and proven analyzing popular music over the last fifty years) these types of apps just makes people create even more mediocracy to torture friends and family with!

Create any music in any style is the idea as he tortured me with his latest opus, explaining that he wanted to see if he could make a latin influenced track. Trying to be encouraging and awake all I can say is that the sound is good but maybe you could try to make your own melody and chord progressions. Knowing that he can do it but alás laziness and instant gratification is the name of the game. 

Something that is obvious is the contradiction that have arisen over the digital era of music making is that the more freedom and the easier it is to make music we definitvely is not gunning for new heights but have settled for excruciatingly bland music and each year more young ears thinks that it is normal and scoff at music that is alive and have some soul!

P.s
​Have nothing against music using a loop or two and there is a deep love and respect for Hip hop/rap (being a constant in my life) which is something different. 
The reaction to this way of music making is the pre-packaging and killing of creativity.
Also totally aware that it is not wrong that people enjoy themselves thinking that they are doing something creative and the ego feelgood that comes as a reward,
​but do believe that it is creating an environment for the future where that is more important than actually taking the human spirit to new levels of real beauty and broadening of our soul!

Google Play:
play.google.com/store/apps/details?id=com.mixvibes.beatsnap

Looking for a fun and inspiring way to make your own beats? Incredibly intuitive and powerful enough to keep you playing for hours, Beat Snap is your new tool of choice.
Pick your favorite style among a catalogue of packs inspired by tracks that shaped pop culture, from Hip-Hop to Rock or Electronic music.
Record sequences in a few taps by playing with sounds made by international producers. Easily visualize instruments on each pad.
Give it a try and you'll make amazing beats before you know it!

FEATURE HiGHLIGHT
• Jam on 32 pads. 
• Record up to 4 sequences to make beats step by step. 
• Get inspiration from a large catalogue of sound packs*.
• Shape your sound with 6 live-controllable FX.
• Send tracks to your friends or play them live. 

MAKE BEATS, PLAY LIVE
• 2 grids of 16 responsive pads each.
• 35 kinds of instruments. 
• Make beats in seconds thanks to an intuitive design.

RECORD YOUR OWN BEATS
• Record up to 4 sequences, one at a time. 
• Use the metronome to play on beat. 
• Loop sequences or play them one after another.

POWERFUL LIVE FX 
• 6 live-controllable FX, including Delay and Reverb.
• Launch two FX simultaneously - one on each grid. 
• Activate each FX from the grid.

ENTER A WORLD OF SOUND
• Pick your favorite styles among 40 packs (more to come)*.
• Features packs inspired by popular songs. 
• Create pro-sounding tracks with high-quality sounds.

SHARE WITH THE WORLD
• Record your tracks in M4A.
• Share your tracks to SoundCloud, or via email, cloud or messaging apps. 
• Get tips to build your skills in the News section.

*requires a subscription

PREMIUM SUBSCRIPTION PLANS
The app offers weekly and yearly subscription plans to unlock all sound packs. 
Please note that subscription will auto-renew unless cancelled. Account will be charged for renewal within 24-hours prior to the end of the current period at the cost of the chosen subscription plan. 
To stop your subcription, go to Account Settings and turn off Auto Renewal at least 24 hours before the end of the current billing period. 
Even if Auto Renewal is cancelled, currently active subscription will continue until the end of the current billing period.
Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription. 

Please go to our website for more information:
Terms of use: http://www.mixvibes.com/terms
Privacy policy: http://www.mixvibes.com/privacy

Follow us for the latest product news and updates:
www.facebook.com/mixvibes
www.youtube.com/user/mixvibesWHAT'S NEW
- Fix Pixellated instrument icons in android 7 for when viewing BPM view
- Fix several crash when trying to record sequences
- Add a menu button for each pack in pack library
- Add a button to clear sequence when recording it
- Force the repeat mode when recording sequence
- Other minor UI improvements

It looks that there has been some work put into this so I wonder why there was no work in coming up with a name!?

Google Play:
https://play.google.com/store/apps/details?id=com.yossibarel.electrodrum

High-quality 16-channel synth, each channel has extensive effects such as reverb, delay, flanger, filters, and more .... Which includes extensive modular options such as: LFO, ADSR, Sequencer, touch control, and more ...

Looking for some rhythms that you may not be accostumed to?
Nice app this as the free version comes with a bunch of rhythms that can be adjusted in tempo, tonality and fills. The Paid version comes with a sequencer to roll your own using the percussion sounds.
It is great that it is possible to get a free adjustable rhythm library that they could have charged for and for a little money extra expand on it.

Google Play:
https://play.google.com/store/apps/details?id=com.rajaramaniyer.jalra

Meet, Jalra - Carnatic Mridangam, an app to make your android device to play mridangam for Indian classical music, dance or bhajans.

This app is musician's best friend. Every student and professional will need it. The purpose of the app is to accompany the musician with the sound of Indian percussion instruments called Jalra and Mridangam. Once you spend few days with this app, figuring out how to configure and use it, the app will become the best solution for music or dance practice and performances. You can also use it for Bhajans.

The app is very simple to use. It has many advanced features like playlist and beat editor. The design is very intuitive and needs no training to use it.

If you are a student, show this app to your teacher, who should be able to tell you how to use it properly for your practice. It will help you get a hold on the rhythm of your music. If you are a teacher, teach the app to your students, for helping them to improve their rhythmic skills.

Detailed Help
A very detailed help is available at this link: https://jalraapp.wordpress.com

Features

-> Mridangam and Tambura all pitch
-> All Talam/Tala supported (count of 3, 4, 5, 6, 7 and 8)
-> Carnatic Music's Saptha (7) Alankara Talams are avaialble
-> Displays count for visual feel of the rhythm
-> Set any tempo you like for the beats
-> TAP twice to guess/judge the tempo
-> No need to keep screen on while playing, runs in the background. Option to keep the screen on if you wish.
-> Convenient notification to stop/start and to bring the app to front. Works even from Android Wear (Watch)
-> Create Playlist - **NEW** paid feature, combine more than 1 style to create a new longer loop
-> Create and Tweak Beats in the Beat Editor - **NEW** paid feature
-> Save local files to google drive as backup or sync across multiple personal devices - **NEW** paid feature
-> Keep Screen On, if required

Fill Button

While the app is playing a style, hit the Fill button to play a static fill variation once. 

End Button

When playing any variation, hit the End button to wait for the app to finish the active playing the active sound and then stop. 

Show / Hide Playlist

You can show or hide the playlist with a toggle button. With the playlist hidden you will get the classic screen simple screen to configure the app.

Beat Editor – InApp Purchase

Press and Hold any one style to open its beat editor. Every beat is divided into 4 parts, with a on/off button for each part. Touch them to swith each part on or off to tweak the beat. When you try to use it for the first time, a prompt will be shown to buy the feature. Once you have bought the feature, you can design / tweak the sound on the beat editor.

Play List

You can add a style into the playlist. When you add a style into playlist, the tempo and count that is active will be used for that item.

There is option to Save playlist to save them as local file. They are internal to the Jalra app. These files will not be visible in File Explorer app. Careful, these files will get deleted when you uninstall the app!

Sync files to Google Drive – Paid Feature

Playlist and new Styles are stored in app's internal files. These files will get lost if you uninstall or reset phone. So there is a feature available to sync app's files with google drive account as backup. Even on google drive these files will be hidden. However, you can see their existence under Settings -> Managing Apps -> JalraApp.

Hide Ads – Paid Feature

The app shows banner ads. If you want to hide it, you can buy NoAds feature by click on "Show or Hide Ads" menu option.

Google Play:
​
https://play.google.com/store/apps/details?id=com.effectone.seqvence

Seqvence is drum machine with step sequencer. You can create drum loops easily by creating drum patterns and combining them into longer sequences. It supports audio samples in wav, aiff and ogg format. 
You are able to store your work, and continue at any time. 
Furthermore, you can export and share your song with friends.

FEATURES

- Step sequencer with 6 channels and 1/32 note resolution

- Note velocity

- Pattern length of up to 4 bars

- 170 internal drum samples

- 20 internal drum kits

- Loads samples from SD card in wav, aiff and ogg format

- Fine tuning sample parameters (volume, panning, pitch, attack and decay)

- 16 bars Pattern sequencer

- 8 available patterns

- Export created loops to ogg or wav format

- Share exported audio

This developer have been around for a long time and the main idea of his earlier work has been the same as this latest one. Which is to make a multi track sequencer without much bells and whistles but fast to work with and still get good results.

I get the feeling too that it is meant to be for practicing which it would be good for. Just to lay some drums and bass for example and then play guitar to it etc.

One thing that is not seen in other apps on Android is the sequencer (it is possible to do the same things in most DAW's if one feels so inclined). There is no stepping in and out of different tracks, everything is on track and the instruments can be chosen from the sidebar.
So it is very simple to differentiate the different tracks and instruments as they are colour coded. This is great as you can see what any given track is up to while composing.
 
It is for free, no publicity and open source!

Google Play:
https://play.google.com/store/apps/details?id=surikov.riffshareii&ref=producthunt

This is a little bit of old news but never saw it for one reason or another. It is an app for sequencing and composing with a whole lot of functions to help with all kinds theoretical issues. Have not explored it yet but it sure looks interesting. There is also a free PC version that can use VSTi's.
If you try it please leave your impressions in the comments section.

To read more in-depth about it and get the PC version go here:
https://helioworkstation.com/

Google Play:
https://play.google.com/store/apps/details?id=com.peterrudenko.helio

Helio is a cross-platform lightweight music speed-painting tool. It features linear-based sequencer with clean UI, integrated version control and more.

It is not so often lately that there is a new app and concept making an appearance. This looks like one. Have not tried it and am slightly skeptic as it seems more focused on the visual side of things but I could be wrong and it would have been good if they had a demo to try before as it is kind of expensive compared to other android apps.
But they do state that there will be a reduced free version soon.

Google Play:

Mazetools Soniface

EXPLORATION & EXPRESSION
With Mazetools: Soniface you can create various styles of electronic music. Everything based on common aspects of notation and music production. The in-app manual guides you towards a visual music experience.

HOW THE GRID WORKS?
The framework of action is a grid. Each line represents a single note. Shining lines are showing playing tones. 

X-Y CONTROLLERS & MULTI-TOUCH
Use multi-touch gestures for altering sound effects or explore the circular editing interface.

DYNAMIC SOUND MODULATION
Merge sounds and geometric shapes! Draw sound waves and automation curves freely with your finger to modify the sound effects.

GROOVE SEQUENCER
Just tap into the circle to set bass drum, snare and hi-hat steps. Easily adjust envelopes and pitch levels.

RHYTHMICAL MELODIES
Let the grid play a sequence of notes automatically using the arpeggiator interface.

LIVE MODE & SPECIAL VISUALS
Use different patterns to create song variations. Add a special kaleidoscope visual to a pattern as a highlight.

SAVE YOUR CREATIONS
You can store single Mazes, patterns or whole sessions into a set. Add one set into another and extend your playing time.

STAY CURIOUS!
We will bring spaced out updates and a reduced free version soon...

Get more information on:
https://www.mazetools.com/

Do you want to contact us? Visit our company website:
https://ectoplastic.com/WHAT'S NEW- Synthesizer based on an audiovisual grid implying common aspects of notation
- 3 way monophone drum synthesizer with envelope, pitch and noise level control and automation setup
- integrated manual
- unlimited pattern and instrument implementation
- arpeggiator interface, envelope setup & note step sequencer
- special “kaleidoscope” visual to highlight patterns
- full-screen mode
- easy composition playback
- versatile file library

Discovered this about a week ago and find it interesting as I am a guitar player and makes composing different than using a piano roll. It has a lot of things going for it which makes it look a little bit cluttered but personally I like that almost all functions are on one page and available.
It is also scalable so that makes everything even easier.
There is a free version for PC and a unpaid version that only have midi import/export disabled but you can still save songs.

To downoad the free PC version:
​http://laggyluk.com/?page_id=206

Google Play info:

Tabster is lightweight and cross platform music creation tool. Note sequencer design follows the guitar tabulature tradition.
features:
-step sequencer
-sample based, configurable instruments
-configurable guitar string count and tuning
-fret/piano mode
-midi export/import (export requires purchasing full version)

there is a free full version for win OS available on my website www.laggyluk.com

Keywords: guitar, tabulature, tab, pro, music, sequencer, reason, tracker, rock, sampler

Have been playing with this some days now and it is a cool thing.
It is dirty and different. It is not sample based and comes with a handfull of effects.
The layout is to scroll from the top to the bottom, starting with the bass drum and ending with the effects section.
There is not many drum machines for Android based on synthesized drums so that makes this interesting but what makes it even more interesting is that there is no drum machine that sounds like it either.

​Anyone interested in aggressive noisy sounds or chiptune should definitevely check this out.
Do think that it is also good to have anyway as it fun to tweak and just being different makes it an added possibility that is hard to get to with other apps.
There is a demo that is useful if you want to sit and record into a DAW for example the full version comes with preset saving and soon to come audio recording.

It is made using Pure Data and ported to Android using LibGDX which is the same as the developer working on Pure Data Party apps. It seems to be shortest way for someone that wants to make quality apps but do not have years to spend how to code properly...

The developer is also active musically and you can hear his music here:
https://soundcloud.com/thiiird

Google Play:

Dragon - Synth Drum Machine

Dragon is a drum machine built to quickly and easily make glitch, distorted, lofi drum beats and manipulate them live. The drums are simple and flexible, capable of some classic drum machine sounds and also new weirdness. Each is synthesized in real time and sent to a multi effect rig with variable speed stutter, bit reduction, pitched feedback delay and a resonant bandpass filter. The drums are triggered by a four pattern step sequencer. Patterns can be changed individually for each drum or triggered together for quick pattern switches for all drums.

Features:
Four pattern sequencer with local and global pattern control
BPM control with nudging
Save/load presets
Three drum synths:
-Bass
-Snare
-Hi-hat
Effects rig:
-Asymmetry and tanh(x) for tape like distortion
-Pitched feedback delay
-Retrigger (aka stutter/buffer) with variable speed and reversing
-Bit reduction
-Down-sample
-Reverb
-Resonant bandpass filter

Preset management requires permission for file storage read/write (optional on Android M+)

Unpaid version disables preset saving and audio recording

Audio recording coming soon. Possible future ports to desktop and ios. Made with Pure Data and libGDX

Full parameter and effect reference:

SYNTH PARAMETERS

Bass drum-
Freq: Frequency. Locks into semitones so you an harmonize easily
Decay: Amplitude decay
Freq Env Dec: Frequency envelope decay. Changes how fast the pitch drops
Freq Env Amt: Frequency envelope amount. Changes how much the pitch drops

Snare drum-
Tone Low Dec: Tone low decay
Tone High Dec: Tone high decay
Noise Dec: Noise decay
FM: Frequency modulate the low tone by the high tone
Freq: Frequency. Locks into semitones so you an harmonize easily, though overtones from fm and the high tone bring inharmonic tones
Freq Env: Frequency envelope. Changes how much the pitch drops
Delay: Feedback delay
Delay ms: Milliseconds of delay

Hi-Hat-
Freq: Frequency
FM: Frequency modulate the tone
Tone Dec: Tone decay
Tone Amp: Tone amplitude
Noise Dec: Noise decay
Noise Amp: Tone amplitude

EFFECTS

Retrig: Loop audio by the specified time interval (1/2, 1/8, 1/16, 1/32 notes)
Rev: reverse retrigger’s playback
Speed: control the speed of the retrigger’s playback

Bit Red: Bit reducer. Mixes in a low bit signal
BP Filt: Band-pass filter. All the way left is off
Tanh: Amplifies and the waveshapes the signal through a hyperbolic tangent curve. Creates a tape-like distortion
Asym: Adds to the signal, creating a DC offset. Doesn’t do much unless you have Tanh turned a bit
Down Samp: Down-sample the signal
Reverb: Mixes in reverb signal
Delay: Pitched feedback delay dry/wet
Delay ms: Milliseconds of delay
Freq: Adjust the pitch that the delayed signal is adjusted by. Also locks into semitones

The new features and a video demonstrating the Ableton Link feature.
This app looks more and more interesting I must say!

Google Play update info:

7Pad v1.1 Perfect sync everywhere now, with Ableton Link.
New Chord step sequencer for perfect groove control.
New quick learn a song shortcut, just plug your usb midi keyboard and start learning the song progression.
Circle of 5th now display in blue relative minor / major in harmonized scale chooser view.
Extended compatibility with usb piano midi keyboards.


https://play.google.com/store/apps/details?id=com.mixtics.sevenpad&pageId=107817317434258015023

Have not delved deeper into this but it looks like it could be one of the better composition tools on Android. It is using the General Midi instruments in your device but can export the midi for later use in other apps/software. Also interesting that they forego the pianoroll and use a more up to down tracker stylelee for composing. Made for easy re-harmonising and other handy tools for faster composing. Maybe a slight learning curve as it comes with more deeper functions than other midi sequencers but should be learnt in an hour or so without too much hassle.
Comes with in-app purchase...

Google play link:

https://play.google.com/store/apps/details?id=com.basisfive.musicmakerstudio2

Google Play info:

Create your own music and songs and play with a multi-track MIDI sequencer.
Turn your ideas into full songs; write and modify sections, chords, notes, and drum hits, quickly and productively.
Immerse yourself in your music, make a song and play with more than one hundred instruments.
It combines several tools to let you quickly shape your songs while exploring different ideas.
For example you can try out different harmonies of a song section: write it once and hear how it sounds when played in different chord progressions, with the one-of-its kind feature of automatic harmonic transposition.
It includes a step sequencer for drum hits, a piano roll editor for detailed note editing, a rhythm editor to try out different rhythm alternatives. Plus, organize your song into sections and modify and repeat them at will. You will be amazed how fast, easy and fun writing music can be with this app.
The sounds are produced by the MIDI synthesizer of your device, so you can choose among all the 128 instruments specified by the General MIDI standard, which include many types of guitars, basses, pianos, brasses, strings, pads, synthesizers, percussion, woods and some effects.FEATURES
- Multi-track sequencer;
- 6 different editors;
- 128 instruments;
- Mixer to program each track's instrument and volume, and to mute/solo the tracks;
- Automatic Harmonic Transposition: lets you apply different chord progressions to the music you are writing, so as to choose whatever sounds best;
- Metronome;
- Playing range selection;
- Save and reuse groups of bars and chord progressions in other songs and/or tracks;
- Quickly copy and modify a section or an entire song;
- Automatic saving at each modification of your composition;
- Export to MIDI format: you can import the .mid file generated to your preferred DAW and take it to the next level, with further sound processing;
- Export all your songs, groups of bars, and chord progressions into the external memory of your device, so you can import all your library to another device, or make a backup copy of your work;
- Import from the external memory (what you have previously exported);
- In-depth integrated user manual, with everything explained.
MUSIC EDITORS
- Song Section Editor: to organize the sections (verses, choruses, etc.);
- Chords Editor: to write chord progressions;
- Tracks Editor: to organize the bars of the multi-track sequencer;
- Notes Editor: to write notes into the tracks;
- Drums Editor: step sequencer for percussive sounds;
- Rhythm Editor: to write chords based on rhythm;
WHAT THIS APP IS:
- Simply put: it's a tool to write and make music (your own music!) and we think it's quite good at it!
- It assists your music-writing creative process, from initial ideas to complete songs;
- You can use it for any type of music compositions, and it's particularly suited to songs;
- You can use it alone, or in combination with a DAW: first write a multi-track MIDI file, then import it in your DAW to apply audio effects and do more elaborate mixing;
- The benefits of using this app relative to another music editor is that it does things from the music composer point of view, rather than the sound/mixing engineer;
WHAT THIS APP IS NOT:
- It's not a tool to automatically generate music from loops or algorithms, you are regarded as a music composer, not just a user;
- It's not a one-fit-all tool: it excels in the creative, music-writing part of your work.
WHO CAN BENEFIT FROM THIS APP:
- Musicians, songwriters, composers, anyone who enjoys writing, composing and making music.
You don't need to be a professional musician to use this app, but it's better if you know at least the basics of music theory (but don't worry if you don't because this app can be an invaluable learning tool for you).
This free version is fully functional so you can make a full evaluation. Only saving and import/export are disabled.
Finally, it's an app written by musicians for musicians!

Wrote about Pure Data Party Publisher before but it is worth writing about again if missed.
So this is apps that can be connected together for jamming over wifi. 
There is a lot of more information on their website plus a lot of information on how to convert Pure Data patches into Android apps plus to make more apps to work in the Pure Data Party Publishers network. 
The apps are all for free and no publicity!
​
So go here and learn more:
http://b2renger.github.io/PdDroidPublisher/

In either case there is a new addition to the family called Manoury plus videos covering the different apps.

Google Play info regarding Manoury:

PPP-Manoury is meant to be used with other PPP instruments.
PPP-Manoury is a polyphonic 4 step sequencer ! 4 step is not much, but each step has a probability factor. The synth is a classic additive synth chained to a resonant filter and a 4 tape delay. With the right set of parameters you can go from 80s classics to deep generative textures.
PPP is a framework offering to support midi jamming over wifi features to audio applications and instruments. That means that apps can be connected to each other over wifi with a slave/master paradigm, enabling each sequencer to be in synch with each others. It can of course be used as a standalone sequencer. More here : http://ppp.mgsx.net

Pmfoundations has introduced Midi-Seq-8, a Eurorack Android to analog synth interface; and a companion Android app, MIDI Sequencer.
The Interface is sold as a full kit, consisting of a set of 2 high quality PCBs, front panel, all basic and precision components and a pre-programmed PIC processor.
The developer says that “The Midi-Seq-8 delivers the convenience of a smartphone or tablet-driven sequencer that directly controls your analog monophonic synthesizer from your Android device.”
Features:

• 8 MIDI channels supported which can drive 8 synth voices
• Play your own MIDI compositions on your synth from your phone
• Create and play CV sequences up to 16 steps on 8 channels
• Gate or Trigger mode
• Adjustable Clock in BPM
• Start / Stop /Rewind / Step
• 8HP wide

The module connects to your Android device using a micro USB cable. It uses a PIC 24 bit microprocessor to convert MIDI messages from the Android app into digital codes which are then converted into gate/trigger and control voltages for 8 channels with TI DACs. These are buffered with precision TI op amps, providing precise tracking over three octaves and to within 0.01V over 5 octaves.
The Interface is available via Pmfoundations for US $149, and the software is a free download via the Google Play store.

via FSK1138

 The collaborative and interesting application Groovecloud now allows for sample import.
This will of course allow for a much more flexible user experience!
Their developer blog is a pretty interesting place to check out as well.
http://thegroovecloud.tumblr.com/post/138088390961/191-a-world-of-new-sounds

The developer have done some apps for iOS and this is the first app for Android.
Did not play too much with it but it is pretty fun and it was not too complicated to figure out.
Without ads, for free and a it makes beats in a different way so worth checking out for anyone looking for something different.

Google Play info:

Insonic is a powerful music sound generator composing tool, designed for creating synth beats outside the usual beat box. Mixing between common BPM/Quantize and human move rhythms at live, this organic music sequencer has the ability to manipulate space rhythms and Q' time. Insonic's virtual sampler contains 144 sound sources; each sound spreads over 2 octaves and can be duplicated infinitely. Features: Wave recorder. Sound filters: HP/LP/BQ/EQ. Sound effects: Delay/Reverb/Flanger/Chorus Etc.

Wanted to mention this for some time but kept on pushing it in hopes that I would find time to make some music with it first... but alas to no avail so better mention this now as for me this and Oscilab Pro is the two new apps that made me most excited 2015.

Bytebeat is a more or less new phenomena and have only existed for some years now. 
It is writing lines of mathematical equations that generate a chiptunish sound/noise so it is interesting as it is a way to accomplish minimal compositions in a new way. 
But think that it is a way to find inspiration for new tracks and rhythms that is hard to get in other ways and mixed in with other elements it can certainly give your tracks an edge.
There is two other Bytebeat apps on Android- Droidbeat and as a machine insert in Caustic.
All three of these apps have advantages but maybe this is the one I prefer for some reasons...
As both Droidbeat and Bytebeat Machine is for free so i suggest to download both and use as needed. Maybe I should mention as well that Caustic is for free without being able to export wav/midi but like Droidbeat it is possible to record directly into a DAW and the last session is saved. Plus that there is a fully functional version for PC... 

The Caustic version do have two engines in one instance that can be mixed together plus that it comes with sequencers and of course the possibility to use 14 of them in a composition. The presets are more meant to be used as instruments and not as whole composition but that is a small detail.

Droidbeat machine is great and it have something that the others do not have.
​It have the possibility to change the sound using four sliders. Meaning that if it is hard to write the code to get good results it is easy to use a preset and just phuck around with the sliders until something nice comes up. To be able to save directly to wav file there is a paid version but the free one saves presets and can of course be recorded directly into a DAW etc.

Bytebeat machine do have one very nice trick up its sleeve and  instead of being confined to low digital rates and bytes it is possible to use a cleaner sound setting with variations. This makes it more flexible as it can fit into mixes better depending on what you are looking for... The other advantage is that it comes with very good presets and presets with the inventor of Bytebeat!
​Just listening to them makes me inspired to start new tracks.
The Playstore page (as in this post underneath) and the app have a good explanation of how to create your own Bytebeat compositions without being to confusing. Well worth a read if you are using Caustic or Droidbeat.

There is of course also the possibility to take a equation from one app to another...
If there is someone using Bytebeat as part of a composition please send to musicalandroid@yahoo.com want to use some Bytebeat myself but never know with time etc and it would be nice to hear this utilized mixed in with other sounds...

Play Store info:

Bytebeat Machine is an experimental software synthesizer. Instead of structured composition or instruments it uses functions to generate audio in real-time.
Sometimes simple input functions contain a large amount of musical structure. Sometimes the result is unexpected.. and interesting. Or you can ignore all that and just use this app to generate bleep and glitch noises. Bytebeat Machine has several preset examples to get you started.
Features
• Free. No ads or other tracking garbage.
• Two modes: bytebeat (8-bit) and floatbeat (32-bit).
• Selectable sample rates from 8kHz to 44kHz.
• A number of preset input functions. Save your own input functions for later use.
• Custom text input mode with copy, paste, undo, mystery button (?) and more.
• Export output as .wav file.
• Various output visualizations. Yay.
• Speed slider (kind of hidden under the presets).
What is bytebeat?
Bytebeat output is fully defined by the input function. There are no pre-set instruments, samples or structures. Even slight changes in the input function produce significantly different output (as a hint, prime numbers generally result in less repetition).
Input function has a time index (t) and usually various bitwise and arithmetic operations. Input function is evaluated constantly and time index is incremented by one in each iteration.
The simplest input function is "t", which produces numbers 1, 2, 3, ... and outputs a sawtooth wave audio. Sawtooth wave is generated because the result is wrapped to 8 bits (bytebeat): 0-255 remain unchanged, but 256 becomes 1, 356 becomes 101 and so on.
Input function "t * 2" decreases the wavelength and produces a result one octave higher. Input function "t & 128" produces a square wave. Bitwise operators << and >> can be used for more interesting results. Input functions can be combined with bitwise operator "|" or even "&" and "^", for example "(t>>9) | (t>>13)".
Bytebeat Machine uses 'C -type syntax' and basic arithmetic operations, bitwise operations as well as comparisons are supported:
- arithmetic operations: +, -, *, /, %
- bitwise operations: <<, >>, &, |, ^
- comparison operations: <=, >=, ==, !=
Bytebeat was first introduced late 2011 in a blog posthttp://countercomplex.blogspot.com/2011/10/algorithmic-symphonies-from-one-line-of.html by 'viznut'. Online tools such as http://wurstcaptures.untergrund.net/music/ surfaced soon after, followed by a theoretical introduction http://countercomplex.blogspot.com/2011/10/some-deep-analysis-of-one-line-music.html and a paper http://arxiv.org/abs/1112.1368. Active community discussion and development in IRC and various forums (pouet.net) lasted a couple of months.
This app might be developed further based on interest and feedback. #bytebeat