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.

So the developer tried to get this application finished using Kickstarter but without success now he got ten thousand euros as first price instead! He won in the category Artistic innovation the one for Sound was son by the iOS application Borderlands.
Last year there was a list of the runner ups maybe it will come later as it is interesting to see what other apps got into the final cut. Phonopaper was one of them last year and as I mentioned in a earlier post  I do think is much more interesting than the winner which was all flash and no content.
In either case EDMT seems to have a lot going for it and also is bridging the gap to video as the idea is to use for projection as well. Better see the video below and then go to the website and sign up to try the Delta version as it is not on the PlayStore yet.
To sign up:
http://edmt.tv/en/

So it is great news that there is a possibility to get a free license for this application that will normally go for ten euros. But it has to be done today or the end of the July the 15th tomorrow.
To sign up go to:
Stagelight Beta Request Form

This version will be for the version number two and can be accessed for many devices in difference to the first. 
Just for 7 inch and up though and here is what is demanded of the devices:

Minimum device specs are:

* Dual-Core CPU

* 1024 x 768 resolution screen

* 1GB RAM (512mb free)

* 300MB of free space

* Android 4.4+

Recommended device specs are:

* Quad-Core CPU

* 2GB RAM or more

This application looks like it can be an interesting thing and here is the official video to see what to be expected.

Came in the beginning of June and has compound times that seems to be something that a lot of people desire.

Play Store Description:

An easy to use sample-based drum loop/beat maker.- single tap note entry/delete
- note velocity editing
- easy copy/paste to assemble blocks/long loops, or even complete song structures
- combine simple and compound time signatures on a per bar basis
- quantize individual drum kit parts for complex rhythmic patterns on a per beat basis
- mixer for level balancing and pan settings
- pads to play samples live
- ADSR editing for drum samples
- import own samples (mono, 16-bit, 44.1kHz, WAV)
- bass editor 
- export as a CD quality wav file (16-bit, 44.1kHz) for direct import into DAW software.

Fun and easy beat creation!

Version 1.0.4 comes with one set of drum kit samples and one set of bass samples.

Planned features(already under development) include filters, additional samples sets and additional tracks for synths/keyboards/strings etc

System Requirements:
Should run on any android version from Gingerbread onwards although performance on older devices is likely to be sluggish. As with all software, best performance will be on newer devices with fast/multiple CPUs and graphics processors.

So this very interesting midi controller based on a Hang Drum.
Create Digital Music have tested it and they really like it-
http://createdigitalmusic.com/2015/06/played-oval-digital-hang-drum-amazing/

Yes it will cost a fair amount of money (that seems to be worth it though) but there is good news for us poor souls and that is that there will be a Android application that is meant to go with the hardware but after speaking to one of the developers he sent me the info and it looks like a nice virtual instrument just on it's own.

The Oval App is still in development. But I can tell you what is the Oval App now and what is going to be in for sure.
The Oval App has several sound sets and scales, hang sounds, percusive sounds and some other sounds, at the moment we have a sitar and several fx/pad sounds.
The Oval App allows to apply effects like delay to the sounds played.
The Oval App will have a four track looper to loop the notes played with the Oval.
We are working to allow the user to upload their own sounds.
The Oval App for iOS will be the first to incorporate Bluettoth connectivity with the Oval. We are working to integrate this capability in Oval App for Android too.


The Oval App will be usable without the Oval, but that makes sense only to prepare settings to play the Oval as the Oval App will lack the sensitivity to pressure and velocity and neither the ample space to develop the body gesture way to play the Oval.

Have mentioned this before but now it is in Beta for Android and it seems to shape up to something fun and could be a key to develop collaborations with musicians over the world.
To get the Beta go here:
http://songtr.ee/beta-invite.php

This is a more or less new application that came to my attention through a reader of the website and it looks like it could be fun and interesting. It seems to me like it is a kind of enhanced 
SPC Music Sketchpad. There is a Windows version as well and the projects are interchangeable with the Android version if you have the right device.

Play Store information:

***Intel Exclusive***Stagelight is the easiest and best way to create, share and play with music on Android. Stagelight comes with built-in lessons, sounds, instruments, loops, effects and much, much more.

Features:

In-app Lessons teach anyone how to make music
8 tracks of playback and recording
Create in Timeline mode or our easy to use LoopBuilder mode using:
-Easy to use Drum Machine
-Built in Instruments
-Audio Track playback and recording
-Choose from hundreds of loops 
-Import your own .WAV or .MP3 files
In-app Store including free content

All songs created in Stagelight for Android can be imported into our Windows version.
Get a free trial of Stagelight for Windows at www.openlabs.com.

Much more to come!

Device Support:

Stagelight for Android is currently optimized and supported on Intel based tablets with the following specifications.

-Baytrail or better
-2GB of RAM
-300MB of storage space
-Android 4.4 or higher

General usage tips:

-Music creation apps love to consume CPU and Memory. We highly recommend that you close out of all other applications while using Stagelight.

-Recording Audio?: Be sure to calibrate your device to compensate for audio recording latency by following the steps below

1) Start Stagelight and press the Options button on the home screen. 
2) Select the Audio tab, then press the "Calibrate Recording" button to display the Audio Latency Tester. 
3) Make sure your speakers are turned up and that you do not have headphones plugged in.
4) Press the "Run Calibration" button. You will hear 8 long beeps which will calculate the latency of your device.
5) Press OK to close the Audio Latency Tester. You are now ready to record.

Need more support?

Check out our forums here... http://forums.openlabs.com/
or
Go to http://support.openlabs.com/ and submit a ticket. We're here to help!

This has been out for awhile and last time I took a look about a year ago I did dismiss it but after accidentally seeing this later basic video it looked much more interesting and can see how this would be perfect for some people.
Maybe the one thing missing would be time stretch.

Play Store info:
Androsynth is a full featured multi-track audio composer, audio editor and effect creator. It contains an audio editor which you can use to import audio files, add effects to them and slice them in samples, an effect editor that allows you to create your own effects from elementary blocks, and a tracker that you can use to compose new music using those samples and effects.Some features are limited in the demo version: songs are limited in duration and there is a maximum number of elements you can use to create effects. There is no limitation in the sampler. 

Sampler features :
► Import most audio file formats including MP3, Vorbis, FLAC, WAV, even audio tracks from videos
► Record audio from the internal microphone
► Add effects such as pitch change, low pass filter, wah-wah, etc ...
► Convenient zooming and editing features
► Save as sample

Tracker features:
► Unlimited number of tracks
► Individual mute/solo/volume control for each track
► Expand and repeat samples
► Add effects and filters independently to each voice
► Master song as WAV in CD quality (44.1kHz, 16bits, stereo) 
► Save/load project
► Zooming, panning, full multitouch support

Effect editor features :
► Create your own audio filter effects
► Start from a preset library of effects that you can modify
► Use your effects anywhere in the application

※ For optimal use it is recommended to use this application with tablets or phones with a 4.7inch or larger screen.


There is more tutorials on the Youtube channel and on the official website:
http://www.draliv.com/androsynth/en/

Tried this a long time ago and found it hard to get to terms with specially on a smaller screen and kind of buggy as well... but if you missed it and like trackers it is for free and without publicity. 

Play Store link:
Milkytracker

Getting more serious with each update. 
It also comes with Midi out now, that is a very interesting option for anyone 
that want to use hir mobile device to control hardware synthesizers and other midi devices.
Would definitively recommend to use a USB Audio interface though, 
if you want to make some professional recordings with very low latency. 
Also would recommend to test the Demo version first to make sure everything works as expected on your device as it costs more than your average application and there can be some issues, me for example had the problem that it saw my usb soundcard as the microphone input and the 1/4 inch cable input as left and right mono inputs and not having any command that I could find for making the stereo track to mono leaving the recording totally panned to the left or right...
( This happens sometimes for me using Audio Evolution to, but not always... )
Could just be something specific just for my USB Audio interface though, it can also have been fixed now as the version I have is the one version previous that got sent to me to test in either case worth testing the demo version first.

The update:
___
- Midi Out
- Support for control surfaces (eg: Korg nanoKontrol2)
- Choose destination directory when saving projects, audio files and midi files
- Customizable back button behaviour
- Various bug fixes
___
Playstore link:
https://play.google.com/store/apps/details?id=com.ntrack.studio.pro

Just like Audiotool another online Daw that sometimes gets mentioned it does not have anything directly to do with Android but it is possible to use over your device if you have good internet connections and use Chrome as your web browser.
So the business model is that you are limited to how many numbers of projects that you can have going and strangely enough in number of drum kits...
There is a free subscription though where there is five projects available to work on. 

It does not come with much in form of sound generators.
So far there is only one basic synthesizer and audio loops available!
Coming with a number of effects though.
But the strength of the application is the possibility to record audio tracks 
and have direct collaborations.
So for bands that live far apart to compose or start collaborations with other people signed up it is great but like said not really with virtual instruments.
To mention to is that everything is stored in the cloud so you can jump from device to desktop etc.
Soundtrap are part of this video from Google I/O 2014 as can be seen here:

Here is a video demonstrating the live recording in action:

Picture of the effects available.

To sign up:
https://www.soundtrap.com/

So there is some apps that can be called workstations with synthesizers, sample capabilities, multitrack, sequencer and so on but there is only one that is for free and that is VuKNOB.
Finally will take some time with VuKNOB as it is now being actively developed with three nice upgrades the last half year or so. 
The last upgrade contains:
__________________________________________________________________________________________________
* New JAM interface, multitouch support
* Automatic chords
* Basic arpeggiator
__________________________________________________________________________________________________
It will be fun to check out this the days to come.
Play Store link:
VuKNOB

If you have been in need of working with loops and samples but have found 
SPC music sketchpad / Supreme MPA / Reloop not good enough for one reason 
or another it could be a very good idea to try this new application.
There is no reason to not try it out as it is for free and the only limitation is that you can only export in 22050 khz instead of 44100 khz. Plus the premium account disables the publicity 
( which is pretty non-obtrusive ).
Basically what it offers is a sequencer where you can build up loops of single shot samples for melodies / chords and drum beats that you can import to a window where you trigger the created sequences or already made loops. 
It comes with pitch and stretch function making it easy to adjust different loops in different bpms and the pitch will keep in tune.
Changing the pitch of the loop will also keep the bpm intact. 
Anyway that is just part of the application and three other things that is less exciting but good is that it comes with a sample editor built in ( which makes sense ), audio recorder built into the sample editor and for me one thing that I like is that worked into the app is 
all the ways to notate and organize your samples / loops.
It is even possible to upload your samples and projects to their website thus leaving room on your device but that is secondary as one of the main ideas is not only the app in itself but to build a strong community around the application for sharing loops and projects.
There is a lot of free sounds and loops available but as people start to use the app more you can listen to loops made by other users and pay in coins which will be around ten coins per sample and you get 1000 coins to start with. The uploader get part of the coins to buy more loops for and you have the possibility to buy a 1000 coins for a euro.
So to me it seems okay as each sample / loop would be 1 cent!
The sounds are also notated ( with all essential information ) and searchable making it very easy to find what you are looking for.
We will see how this business model works out and to be fair to the developer it protects and upkeeps their server to if there is a lot of users downloading and uploading a lot of sounds and projects.

When testing the app out the one main critique in my mind is that it was without effects 
and some smaller issues but seeing their timetable of coming updates it seems that all my critiques will be taken care of. 
Also one thing that could be a critique for some that is not planned is for internal synthesizer/s as it will keep to the realm of samples and loops and a workflow that revolves around that.
To make it easier for myself and for you dear reader I will just post first what the application contains now and then what is planned... plus something very important the tutorial videos as it could be a bit complex to orient yourself otherwise and they also gives a good insight into the workflow.
_________________________________________________________________________________________________
Sample Import: WAV, OGG, AIF, MP3, 11 / 22 / 44,1 / 48 KHZ, Mono/Stereo
Sample Editor with Click Track, Loop Flag and Audio Recorder 
Instrument Editor for Melodic and Percussive Instruments
Pattern Editor for Melodic and Percussive / Drums Patterns
Pitch Shifters on several Layers
Live Tempo Shifting while Maintaining Pitch
Automatic Loop Point Finder with Cross Fade
Volume Mixer on Four Layers 
Community Based Sound Library with fast search functions
Easy-To-Learn Soundboard Sequencer and Arranger
Projects, Parts and Recording Variants
Share Your Projects, Work Together on New Songs
Song Export to OGG

What is planned for future upgrades:

Community:

Open Community (Uploaded content will then be visible by public and indexed by Search engines) Q3/14

User comments on articles Q4/14

People Pages - planned for Q1/15

Friends and Bands - planned for Q1/15

App / CommunitySearch optimizations: 

Categories, Filters, Facets, Sort By - planned for Q4/14

Uploads of Recordings with Cueing Information - planned for Q4/14

Uploads of Instruments - planned for Q4/14

Uploads of Projects - planned for Q4/14

App Core and Usability:

Effects (Delay, Filter, Reverb) - planned for Q4/14

Shuffle Mode ('Swinging' the rhythm) - planned for Q3/14

More Randomness Settings and Versatility for Slots playing - planned for Q1/15

Song Editor (compose by lining up parts / variants) - planned for Q1/15

Automation curves for mixer and effects planned for Q2/15

Notekey Finder for melodic notes planned for Q2/15 (Interims solution with playable keyboard planned)

Automatic BPM finder for Sample Loops planned for Q2/15

Multitouch Soundboard - planned for Q1/15

App InterfacesMIDI import / export - planned for Q3/15
__________________________________________________________________________________________________
There is also a homepage of course where you can find out more...
https://www.ufxloops.com/


Play Store link:
uFXloops

Syntheogen updates giving me a reason to mention this excellent app again!
This multi track synthesizer / sampler application is the number one choice for anyone looking to work in different time signatures and poly rhythmic mayhem.
Actually it is one of the few fully featured apps as it contains multi track / synthesizers and sampler plus a good selection of effects and can be a good alternative to Caustic / SunVox. 
If you have not tried it there is a free version and the full version is very cheap.
Here is an in depth review that I recommend that you read:
http://www.musicalandroid.com/reviews/category/syntheogen


The update contains:
__________________________________________________________________________________________________
Make off-guide steps visible and editable
Display NOTE PROPERTIES when step long-tapped
Allow steps to be moved with long-tap and drag
Fix LOOP STEPS display of short steps in expanded element
Fix ALL TRACKS view after track created
Allow positions and lengths to be specified with mixed fractions
Improve LOOP STEPS render performance
___________________________________________________________________________________________________
Play Store link:
Syntheogen

To be honest I never used PocketBand Pro or had any interest as it requires that there is a good internet connection. It has a lot of users though and there seems to be people happy with it. In either case if you have or had an interest it now is 50% off.

Playstore link:
PocketBand Pro

Here is a new application that for sure is going to make some of you very happy.
It came out on Saturday and did not have a much time to try it out but the little I did has all been positive impressions. 
First impressions being that it seems very well thought out and a lot of the design has been towards a different workflow than similar apps and on paper it can feel a little bit gimmicky but it makes sense when you sit down with it. Would say that it is very well thought out for making electronic music as it all revolves around the idea of flexible arpeggiations and manipulating the resulting loops in different ways.
There is three different sound sources that being a synthesizer, 36 sample instruments and then 15 drum/percussion sets. You can use four tracks for the Synthesizer/sample instruments and two tracks for percussion. The percussion tracks with a standard sequencer the synthesizer/sample instruments with a different way of sequencing.
You choose the notes you want to be used and then the steps you want the notes to be triggered on. Now comes the interesting and different part. It uses flexible oscillations to determine how the notes will be played. Making oscillators be the decisive faction of the arpeggiation/note sequence. It is possible that this is not totally clear but it will be when you use the application. 
So it offers a new way that I have not seen in any other application to compose music and being designed to be used as a groovebox it is very easy to change things on the fly.
So for example decide on a scale and use the notes on the four melody/harmony tracks and just start to manipulate and almost everything that you do will come out good but without sacrificing the feeling that you are in control and that it is your own music being created.
You could use this for making whole songs and there is already music that you can hear as examples here:

As gets obvious after listening to the tracks is that the sound quality is very good.
I do like the synthesizer a lot and it can be very gnarly in a good way and you have a lot of options to manipulate first and foremost the oscillators of course as everything is based on oscillation in almost everything you do. There is the possibility to combine and intermix oscillators in a many a ways and it does sound good right away without any help from effects. As said before there have not been much time to look into the app yet so I have not tried any of the sampled instruments or any of the drums yet but they seems very good to.
All in all if you do electronic music I do recommend this application highly as you can use it for doing whole songs or part of songs to import into other applications  but it is made for direct manipulation so it is  great app to use as a part in a live setup.
There is some concerns though- 
You will need a good device but if you have one that is good enough the app feels very stable and it seems hard to overload it creating nasty CPU overload which is a big bonus if you want to use it for live recording/performance. It has some limitations in sequencing as you will have to adapt to the specific workflow. Having said that, 
it is also one of the strong sides of the app. 
Finally screen size. 
Do recommend a 7 inch or bigger. I have tested it on a 4.7 screen and it is workable but to fully enjoy it think bigger and can not see it being enjoyable on smaller than 4.7 inches.
It is half price for now as introductory price and it would have been better if they had a demo version to try first but I would say that if you like to make electronic music it feels that you are going to be able to use the app in one way or another and think that it can be a very good addition especially if you like groove boxes and direct manipulations.
It is also a very nice addition to your synthesizer palette as you can get great tones out of it.
I do like it and felt sceptic when it first got announced as it seemed to me that it was just a variation of existing apps but when it got tried and there was an understanding of how it is set up I got excited to start to use it in some of my music or even as a main compositional tool for some tracks.
This is a very limited overview and hopefully next week after finishing some other projects there will be time to get into this deeper and take a look at the video and remember that it does add another way of thinking that is not totally obvious in the video.
For anyone that have some experience in slightly more advanced music apps it is easy to figure out things intuitively and even though the application offers a lot of possibilities it did not take me long to figure out most of the functions.
Here is a short review published by iosmars.com:
http://main.iosmars.com/2014/05/30/oscilab-review-a-new-sequencergroovebox-from-2beat/

and remember it is half price for now...
Play Store link:
Oscilab


For more sounds...
https://soundcloud.com/oscilab

This is a video of the HTML5 version of an application that I wrote about the other day that is in Beta but downloadable through the Play Store if it looks interesting to you, plus that you will help the developer out finding bugs and giving suggestions.
One thing that would make it more attractive for me is if you could import / export the midi files separately and the developer has said that he will include that in the future.

Play Store link:
Music Riff Studio 2

The developer is asking for people to help him out and try this Beta version downloadable directly from the Play Store for free maybe it is a good idea so we can influence the developer to make something good!
One thing that would be very useful for an application like this would be to have separate midi export. It is an application well suited for composing in a fast way and if it had separate midi export it would be easy to import into any DAW or Caustic (Caustic being one or the only application that can import seperate midi files into separate tracks). 
As I see it one thing that makes it hard to finish actual songs is that it is easy to get distracted with all the funky things you can do with effects, automation and just sculpting your sounds in the sound generators / Synthesizers. If there was a General Midi composer where the distraction did not exist and you could easily export to separate midi files there could be a big improvement in workflow.
So it is Beta and the developer needs help so please download it and give him suggestions!
(One thing that i noticed in this Beta version is that you have to tap twice on the menu items which can trip you up and dismiss the app.)

He made another app before this that is interesting to and it is a sequencer app with a few select instruments making it into good sketch pad. It is more directed to sketching out music for a pop / rock band than electronic music but can of course be useful for anything and it offers a few things that you do not see in other apps.
Here is a video of his other application (for free and no publicity).

Play Store links:
Music Riff Studio 
Music Riff Studio 2 Beta

Android have a new contender as a serious portable DAW now. 
n-Track studio can now like Audio Evolution Mobile record low latency high quality audio through a USB soundcard.
It also have included General Midi instruments that you can sequence/record on midi tracks.
There is two options to buy n-Track Studio one cheaper version that have in-app purchases to chose from or the full version directly with all the goodness activated directly.
It is fully interactive with the desktop DAW that the company makes which am a very interesting cheap good alternative to more expensive DAW's.
Android is definitely moving forward!

Play Store info:
-----------------------------------------------------------------------------------------------------------------------------------
• Support for USB audio devices, stereo & multichannel *
• not all devices are supported: USB compatibility chart available at http://goo.gl/R7l3Yb
• MIDI tracks with Piano-Roll editing window *
• Built-in General MIDI synth *
• Support for USB MIDI keyboards & controllers *
*Features available as in-app purchases
----------------------------------------------------------------------------------------------------------------------------------

Play Store Links:
n-Track Studio 
n-Track Studio PRO

Website with information about the Desktop DAW:
http://ntrack.com/