Google Play info:
https://play.google.com/store/apps/details?id=com.leescott.fingerbass

When the app first got on my device it got played around with for a while but forgot about it until now half a year later and it is interesting to make some ambient basscapes with.
It works by touching the screen in one or two spots move things around and it records your gestures for about ten seconds and if you let go of the screen it will continue to loop around.
It has a deep nice sound to it and would be well suited for recording sessions and then cut out the best parts. Can see it as a good companion to Virtual ANS for ambient excursions that can scare children, anxious old ladies and muscular men suffering from insecurity.
For free and no publicity!

Play Store link:
bass bender

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

It can not do too much but it sounds good and is for free without publicity. 
Comes with four waveforms- Sine, Two different square waves and one saw wave.
You can control the octaves and pitch with the bottom controllers- 
Which are easier to reach if you hold the device upside down at least if you are using a phone ( and you are playing at the same time ). 
Then you have access to the four corners around the speaker that you can program with different effects.
The application is responsive so it is easy to test and play different things out.
When it got tested was thinking that it is good for direct recording on top of another recording to get the groove right and that is exactly what they are doing in the demonstration video. 
Yes this will be used sooner or later.

Playstore link:
Master the Bass

P.s- Audacity is a free Sound editing program for P.C / Linux / MAC

Link to Audacity:
http://audacity.sourceforge.net/