Do not know how well this works and the app is still in Beta but it if it works good this mighty cool.
To read more about the controllers:
https://www.freedrum.rocks/

To read about how to hook it up with G-Stomper app:4
https://www.freedrum.rocks/setup/frequently-asked-questions/playing-with-android-gstomper
​

So this video show pretty clearly that there is Android devices that can work with totally acceptable low latency. They are using G-Stomper that admittedly are optimized for low latency as well. The Freedrum sticks looks like a great thing to have as well as a drummer. The sticks are still on Kickstarter but fully funded.
To read more regarding the Sticks go here:
https://www.kickstarter.com/projects/freedrum/freedrum-the-drumkit-that-fits-in-your-pocket/

So the last update brought with it the possibility to buy midi instruments directly from the app as soundfonts. So here is some demo sounds of drum kits...

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.

It is many of these types of apps out there but the developer has worked on getting this to be as low latency as possible and to my ears it is very responsive and totally usable for live recording and in difference to 90 % of these types of apps there is no publicity.
The samples are fixed but for sure there is some of the sounds that can be used like laying a hi hat pattern down and get some real time played groove recorded!
For freeeeeeeeeeeeeeeeeeeeeeeeeeeeee...

Play Store link:
Heartbeat Drum Pads

It is very easy to use and what it does is randomizing a beat for you and you can see the rhythm laid out in notation. This you can change around with accents and changing the drums around plus more settings to adjust things to your liking.
This is excellent if you have a hard time programming drums as you can just copy the rhythm patterns in your sequencer when there is something that sounds good. 
As a bonus learning how to program rhythms just by copying the patterns would get fixed in your minds eye for future use.
Not to talk about using it for practicing instruments or to learn drums, hey there is even hand / foot and accent notation.
But there is one glaring omission and that is that it can only play one drum sound at a time...
So for the hi-hat patterns it is still necessary to think a little bit for yourself, the same with the kick and snare... and there is no time signatures except 4/4.
There is bpm though and it can still be of help as it can make the ground work easier for non players.  Hopefully it will be expanded upon as for me it could be a lot of help rhythmically.
For free and it is supposed to be publicity but there has been none on my device.

Play Store link:
Linear Grooves

It is meant mostly for having rhythms to practice to, but it also contains a sequencer that you can program. 
The Sequencer contain a fine degree of steps (one quarter note contains 24 micro steps) to get very intricate rhythms going making it less good for direct programming but very good for the discerning musician that needs the rhythms just right. 
The sequencer is not the main course though as the app is more for having rhythms already made with variations to switch things up with during practice sessions. 
Yes there is a bunch of these apps out there but this one comes with three things to make it stick out from the crowd. 
First being is that the samples comes round robin (playing slightly different versions of the samples at each hit) This as far as I know does not exist for any sampler at all for Android.
The second thing is something that I wish was a function built into more apps and that is a humanize function so you can decide how erratic the hits will be as no human can play in perfect beat this in combination with round robin adds to humanize the rhythm if you want.
The third is that you can use a footswitch with a USB-OTG cable to switch in between fills, intro etc while playing a instrument.

It comes in three flavors all of them containing all the functions but having a varying degree of drum sets / sounds and rhythms already programmed.
The most basic one is for free which is a good thing especially if you are thinking to use it for programming rhythms as the programming of rhythms can be slightly tedious (it is not that bad but there is a lot of people that have no patience). One thing that could be good to implement would be to have the "micro" (ticks) steps in between collapsible that you have in SunVox and in other trackers making it easy to program the main rhythm and then add smaller additions. Otherwise if there is only a need to have rhythms to practice to there is not anything negative to say about the application.
Maybe it would be good if you could import midi files. 
Actually it could be hard to work into the same app as it is set up but maybe... I am not a programmer and have learnt what seems to be obvious and simple to a non programmer...
is often not the case.

But definitely worth checking out if you need a drummer / rhythms for your practice sessions in either case.

So to check out what the different versions have to offer:
Drum Machine Drummer Friend Free
Drummer Friend - Drum Machine
Drummer Friend HD Drum Machine

In the first video he is switching the rhythm by hand this is not necessary if you have a foot switch. Which is one of the selling points of the app. But I think the video is before this was implemented.
In the second video he has hooked up a audio receiver to his computer that records the audio through Bluetooth. I did not know that this was possible until the developer told me and that this is possible for almost any (or all) Android devices...
Learning some basic facts about Android every day....

Normally these type of applications do not get written about too often but as there was some investigation into a new application called Recording Studio ( that has some good sampled instruments but at this moment with shaky timing and other chuppililupps ) stumbled across this one which is an expanded version of an application called Perfect Piano and has been around since the dawn of Android music applications. 
It has now matured into something more and can be useful for sketching out ideas for real instruments. It comes with a lot of instruments and there is many more that you can download to incorporate into it for free. 
It is made for direct recording and feels responsive enough to pull it off depending on device and it is USB compatible for devices that can use OTG cable. Remember to that if the latency are too high for your device you can do the recording in slow tempo and then speed it up. Strangely enough it has a sequencer but only for the Drum machine but think as that would be the part that is most important for recording the rest it is all good. Coming with Midi export you can also adjust timing etc in another application / program that can open Midi.
It is also meant for being able to practise the piano and it can be notes falling or scrolling notes.
It does comes with publicity which is normally annoying but they have made it non obtrusive and it is not annoying and if you do find it disturbing there is always the possibility to turn off the internet connection for a while? 
Another reason that I am writing about this application is that there is a contest going on that will be written about in the next post!
Playstore link:
Walk Band

Here is a short but to the point how to make percussion sounds using subtractive synthesis.
The intersting part that it is made using a high end Moog synthesizer and it would be funky if you dear readers tried out any of your Android synthesizers using the same instructions and see how close you can get. If you are happy with your result please share with us.
You can send your result and presets etc here - musicalandroid@yahoo.com

It is strange that nobody has tried to do a drum machine yet with real time synthesis.
Here is one in either case that has been out for about a month.
Not only is it the only one it sounds good to. 
This is the second application that have been discovered by me the last month that almost got dismissed as soon as it got opened. As there is so many crappy pad / sequencer chuppililupps out there it looked like all it was going for it came down to four sample based drums in a very short sequencer. 
Maybe it was that the look was different or that it was no publicity but lingered a little bit longer on it than would have happened otherwise. Discovering that pushing the left side a new page opened up where you got access to different parameters for each drum making it a truly flexible gem of an application.
In the simple interface is hidden a world of synthesized drums and even though it is only one bar to the sequencer it is so easy to switch the pattern around in real time. 
Switching page you then have a very good way of interacting with the touch screen making changes again in real time. This has to be downloaded by anyone of you that want to use a good drum machine for live tweaking. Here it is would I dare say even better for live work than many hardware drum machines as you can sweep sounds with your fingers.
In this application it feels like a save mode is unnecessary as it is so good and easy to set up 
and so fun to play with that it helps that you do not get bogged down in presets or saved sequences.
Plus as said before it sounds excellent!
I am just happy that it did not get thrown out, dismissed and cast out of my life because of short attention span!
Bonus points is that it is for free (would gladly have paid for it) open source so you can download the code and even better made in Pure Data, the open source visual programming language for making music.

Playstore link:
https://play.google.com/store/apps/details?id=net.simno.dmach
To get the code for Pure Data go here:
https://github.com/simonnorberg/dmach

Well at least I tried it...
Just posting because the video is funny and even if it is not good or much of use,
any application that tries to take us out of the complacency of doing things as always deserves some kind of attention...
There is another application that is similar that if for some reason this excites you called Air Drum+

Playstore links:
Air Drums Thump N Snap
Air Drum+

There is some paid applications that are much more comprehensive than this one but this one has something that other does not have which is a way to in one touch affect the harmony by using the Chord progression function getting changes made on the fly.
Otherwise it is two different synthesizer engines and four drum sounds to sequence...
If there was only this application that existed for Android we would probably be very excited.
Playstore link:
Phonstrument

Pure Data seems to be one of the fastest and easiest ways for a non programmer to make quality music applications but it can also be used in so many other ways as is seen in this video.

This could come in handy for practising your instrument. It sounds good and it is easy to change the tempo.
It could also be seen as something to use as samples if you are looking for realistic drums here it is especially helpful that you can change the tempo as most sample packs have a fixed tempo that you could not change too much in tempo without weirdness occurring. As I have not tried the application I am not sure if there is a way to get to the beats directly or save them as audio you may have to record them into something else if you are going to use them as sample fodder.
It is only 0.72 € / 1 $ as it is 70% off for a limited time.
Playstore information:
--------------------------------------------------------------------------------------------------------------------------------------
Drum Beats+ is a simple and fun collection of drum loops for stress-free jamming and songwriting accompaniment. No assembly required! Ranging from 1 to 4 bars in length, these loops are great for casual practice or exploring song ideas. Plug into Hi-Fi speakers for the best sound (or just play right from your device!).

----------------

FEATURES: 
- Gorgeous, Simple Design 
- Over 75 Drum Loops (Various styles) 
- Beat Pack Store (coming soon)
- Includes "Hit Song" Pack 
(remakes of beats from 16 chart-topping songs) 
- Easy Tempo Changer (60-190BPM, intervals of 5BPM) 
- Tempo count-off (precount) 
- Loud and Clear Sound (Professionally Mastered) 
- Save Favorites 
- Randomizer Button 
- AirPlay & Multitasking-enabled

----------------

HOW IT WORKS: 
1) Tap a beat to start playing. 
2) Tap 'Tempo' to change the speed. 
3) Tap 'Star' icon to save a favorite beat.

----------------

WHY IS THIS APP UNIQUE? 
Drum Beats+ was created for those who simply need great beats fast without fiddling with machines or waiting on a human. The app store has plenty of drumkit simulator apps, as well as more complex beat-making apps - but for the musicians who just want great beats on-demand, there were no serious options - until now. And unlike other ‘instant drum’ programs or loops, Drum Beats+ has been optimized for ease of use and creative accompaniment.

A VARIETY OF BEATS 
Drum Beats+ ships with 75+ loops created by a professional drummer and offers out of the box accompaniment for almost any types of music imaginable. Expandable packs cover even more ground with more genre variations, niche collections, or lesson specific offerings.

EASY TEMPO CONTROL 
One-touch tempo adjustment. Each beat is sampled at the following speeds:

60 BPM 
65 BPM 
70 BPM 
75 BPM 
80 BPM 
85 BPM 
90 BPM 
95 BPM 
100 BPM 
105 BPM 
110 BPM 
115 BPM 
120 BPM 
125 BPM 
130 BPM 
135 BPM 
140 BPM 
145 BPM 
150 BPM 
155 BPM 
160 BPM 
165 BPM 
170 BPM 
175 BPM 
180 BPM 
185 BPM 
190 BPM

----------------

TWO WAYS TO PLAY 
1) Tap a beat name to play. 
2) Tap the 'Randomizer' to quickly audition random beats. (Great for fresh inspiration!)

----------------

INCLUDED PACKS:

+ STARTER PACK: 
A collection of 16 must-have drum beats spanning rock, blues, jazz, as well as artificial. Think of this as the 'Pack of All Trades'.

+ HIT SONGS 1: 
16 beats modeled after some of the most popular and easily recognizable songs ever recorded. Perfect for playing along to the hits or making entirely new creations!

+ POP-ROCK 1: 
Whether you're looking to write your next hit song or just add spice to your practice, this pack offers 22 fun and versatile beats.

+ BREAK BEATS:
Cool, hip and edgy grooves to get the party started.

----------------

HIGHLY EXPANDABLE W/ 'BEAT PACKS' (coming soon)

Add to your collection of loops with a growing selection of both free an paid content. Capture an entire genre, vibe, or specialty with a collection of beats that is as endless as your imagination!
-------------------------------------------------------------------------------------------------------------------------------------

Playstore link:
Drum Beats+ Rhythm Metronome

Pavel Ti is showing you in this video how you can use just the basic synthesizer module in SunVox and coax out a whole lot of different kick sounds out of it. It is interesting that it is just one module and the more basic synthesizer getting used except in the end when he uses the wave shaper for more Aggro stylelee. 
From here you can of course go deeper with combinations of more modules etc if you want. 
If you use SunVox it feels like this video is obligatory...
It is a good thing to roll your own Kicks!!!

Playstore link:
SunVox

This is something that could be usable not only for drummers...
As you can download directly into the application drum notation from the internet and import it into application that allows for Midi import and so have professional sounding grooves already made.
Or just Notate your own in Midi it also can save it as Sheet music and is integrated with Software that existed for many years for PC.
It requires Android 4.0 and and a 7 inch or bigger tablet- 
On the website the developer says that if you want it for smaller screens to contact them.
I guess especially nice if you are a drummer.
Dont understand the pricing as on the website you can download a Android version for 14.95$ and the PC version for 29.95 $ and both for 39.95... 
But if you go to the Playstore page you get the Android version for free- 
so just try it and make them beats go mjiauu.


Would be pretty pissed of paying money for the app and later discovering that the Playstore download is for free... But what do I know?


Playstore link:
Tab trax

So this must be a god sent for a lot of drummers and for studio work-  
Also for getting your own drum tracks tight in your home productions as drum sounds don't respond to well to normal tuners.
Free and you can tune each lug head on your drum, 
if I was a drummer I would willingly pay for something like this!

Playstore link:
Drumalyzer 2.0