I don't know much about the reason, but you have to do this on the file Muse
0.6.3 uses (sf2, and .wav) ifnot they won't be loaded.
open wave file(/DATA/Musique/11-dafty/waves/Basse-sound-DTD.wav) for reading
failed: Could not open file.
clip: file not found
load soundfont /DATA/Musique/11-dafty/909.sf2
fluidsynth: error: Unable to open file "/DATA/Musique/11-dafty/909.sf2"
fluidsynth: error: Couldn't load soundfont file
fluidsynth: error: Failed to load SoundFont "/DATA/Musique/11-dafty/909.sf2"
I have the impression this issue arise when capabilities are used.
Well i don't know if the new muse0.7 is affected by this. I have it compilled
btw, and it looks very niiiice :)