Al1 & Ant1 has done. It is a duo doing music / concerts and workshops where they share their homebuilt sound generators and show people how to do them.
The applications being a Android version of some of their creations.
It may seem a little bit limited but think that it is more than useful for some things if you take your time and dig into it.
It is four different types of sound Generators / effects.
Being for Melody, drums/beat/percussion, recordings to device for manipulation and one that comes with the explanation;
The Old barrels for consumption based on ancient recipes and ingredients...
Which I think is the same sound generator as this being explained like this -"Les vieux fûts" keyboard gratin dish for gear of variable speed producing a note by the vibration of a blade attached to a guitar locked in a cage attached to an old scale.
Okay guess the language gets slightly poetic as the developers are french and words gets spiced in translation but it does feel refreshing to read such a choice of words instead of straight on description of functions!
It is for free and no publicity so give it a try.
Here is some videos showing what the Android version is emulating.