What I mean is, can you choose an ogg file as instrument in midi editor?
I'd like do know if MMM uses ''virtual keyboard'' functions that are on other music programs like LMMS/FL Studio, who use ''piano-roll'' for .ogg sounds.
quite simply, no you can't In MAGIX Music Maker 16 you can only use VST instruments which play the notes contained in the MIDI files. However, there are free of charge instruments out there you can use. Sorry I can't comment more precisely on the programs you listed. Cheers, M o' L