NEiM0D send a beta of his recently created MOD-Player for GBA to You can download the file from there (Thanks to GBAdev for the news).

Author notes:

Here I present you a preview of the upcoming NMOD Player.

Features are:
– Stereo (channels 0,3 left;channels 1,2 right).
-4 channels playback.
-16000Hz samplerate.
-All protracker effects are supported.
-Small size (5k!)
-Plays straight from the MOD format, no need to convert it.
-Fast (average 10% CPU usage)
-Ability to syncronize your demos with the volume / note / instrument / row / pattern and much more! 🙂

Oh and, it will be open source!! assembler source & C source included!