Cool, I used to use this on the DS... and I always used the mic to record my own samples.
EDIT:
Okay, I'm digging through the Wiz/GP2X/GP32 file archives and downloading all of the tracker-related applications I can find, and I'm going to test them all through Ginge (on f/w 1.6.1).
My results so far:
Working Perfectly:
-Drumbox
http://www.youtube.com/watch?v=V-OhaxmUkow
Perfect so far!
-PBSynth:
(no video yet)
Works fine! I just needed to calibrate my touch screen.
-StepSeq2x
http://www.youtube.com/watch?v=UtIQsaD_gFk
Perfect! Even the touch screen works!
Mostly working:
-Milkytracker
http://www.youtube.com/watch?v=gGbXWX0bcz8
Touch screen control does not work, and I don't see a cursor for the joystick on the screen, although it is working. You can still play or edit songs, but it's just harder and you have to keep track of where the cursor is. I've also noticed that the playback is either ahead of or behind the cursor position when songs are played. I have yet to try my own XM files.
However, in the older version of this program, none of these problems occur, but keep in mind that this version doesn't have touch screen support to begin with, so it won't have touch screen support. However, I'm currently working on porting the most recent version of Milkytracker to the Caanoo. I'm almost done; just need to remap the controls.
-E

rumMachine:
http://www.youtube.com/watch?v=qstxwwQUUxo
Works fine, but it often crashes and returns to the Ginge menu.
-GP2xTracker:
http://www.youtube.com/watch?v=KqGPKhH0g28
Works, but there's lots of slowdown. It's not complete software yet, anyway...
-OldPlay
http://www.youtube.com/watch?v=XiNOAzF1eNM
Works, but the playback is a little quiet and it's buggy.
Not working at all:
-Xylophone
It hangs after startup.
-BSPlay
Returns to the Ginge menu.
-GP2xPD
Returns to the Caanoo menu.
-Soundbox:
Returns to the Ginge menu.