Hi all, As it's an audio related question, I try here. In two words, for a good reason of mine I've been pushing the Lilypond's midi output on its limitations. I cannot get more than 30 output tracks! depite the fact I only use the channel 10. I can understand it from Lilypond. But I'm wondering why this happens. Is it a simple missing implementation of a port which will be relatively easier to solve or a deeper issue on the midi? More. Here is a cut of midicomp. You see at the beginning that Lilypond encodes 61 tracks (60 + the control track) MFile 1 61 384 MTrk 000:00:000 Meta SeqName "control track" 000:00:000 Meta Text "creator: " 000:00:000 Meta Text "GNU LilyPond 2.12.2 " 000:00:000 TimeSig 4/4 18 8 000:00:000 Tempo 600000 000:00:000 Meta TrkEnd TrkEnd MTrk 000:00:000 Meta TrkName "" 000:00:000 ProgCh ch=10 prog=0 000:00:000 Meta InstrName "drums" 000:00:000 Meta TrkEnd TrkEnd MTrk 000:00:000 Meta TrkName "mar" 000:00:000 ProgCh ch=10 prog=0 000:00:000 Meta InstrName "drums" 000:00:000 Param ch=10 con=7 val=85 000:00:000 On ch=10 note=c3 vol=127 000:01:000 Off ch=10 note=c3 vol=64 000:02:000 Param ch=10 con=7 val=67 000:02:000 On ch=10 note=a4 vol=127 000:03:000 Off ch=10 note=a4 vol=64 Each track has its empty copy. Has someone an explanation? Cheers. -- Phil. Superbonus-Project (Site principal) <http://superbonus.project.free.fr> Superbonus-Project (Plate-forme d'échange): <http://philippe.hezaine.free.fr>