The strength of a soundtracker is in its patterns, keyboard shortcuts, and GUI efficiency.
A port of the Renoise playback engine to Andoid could be possible with a lot of work, maybe through the usage of the SDL/NDK libraries.
But first of all it should only be available for tablet users.
Let’s drop VSTs or VSTis that won’t work.
And then, the interface has to be 100% rewritten.
Renoise has no “virtual keyboard” that could insert notes in a pattern. Adding a usefull ‘virtual keyboard’ in the GUI interface implies to entirely re-think the bottom screen logic.
What you do easily, like pattern scroll up, down, left right, play a line, select, drag & drop, cut & paste, won’t be that easy.
Milkytracker’s virtual keyboard and overall interface on a Galaxy Tab are a failure.
And even with a virtual keyboard (piano-like thing) the ‘shortcut’ logic is lost.
With actuel tablets, you don’t have the precision of a mouse. So changing precisely automation & envelopes points couldn’t work. What is very bothering.
Even owners of desktop computers complain about the “sample keyzone” space that isn’t wide enough. I suppose that using this feature on a tablet screen will be a pain in the ass.
Think about the + & - buttons that control the number of note columns & pattern effects. Some buttons or fonts have to be bigger.
The pattern matrix can only be used with one shown pattern track.
Finally a complete GUI redesign should be needed.