Hello,
there is a multiplatform sequencer calles SUNVOX.It is available for Windows, Linux, Mac OS,Iphone and Pocketpc.

http://www.warmplace.ru/soft/sunvox/index.php


A really nice piece of software.
As a linux software it should not be too difficult to port to maemo.
There is a poll on the authors forum. "Which platforms must be supported by SunVox?"
http://www.warmplace.ru/forum/viewtopic.php?f=3&t=1072

It would be nice, if we all could go to the forum and vote.
There is also a discussion about platforms, that should be supported.

I think we have a chance, if we vote and discuss..