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Thank's for your response! 
I use samples (only) on a (very ugly) sequencer I made on the nintendo ds in C with the help of an open source project. I use max_mod and devkitpro, there is examples on github for auto compile sample from wav files in a folder named max_mod in the project. So it's on the rom file. I don't know if something similar exist on gba but on ds it's very easy. 

But yea, it would mean more works that's true, the important is making something you like :-) I tried your sequencer just a few minutes and it seems to be a lot of fun!

The implementation of CV gate written in the description would be sooo awesome! O.o   For my part I use "sync" in my nds sequencer, which is just a button who transform all the sequencer to mono and pan all to left and use the right channel to send a Sync sample. It needs a Y cable and it works good with korg machines because they accept low level sync