In GM standard MIDI files, channel 10 is reserved for percussion instruments only. Notes recorded on channel 10 always produce percussion sounds when transmitted to a keyboard or synth module which uses the GM standard. (via WikiPedia)
However, the sound driver of AddMusicK / AddMusicM do not have such feature. If you convert a song from MIDI, you have to define different instrument and other channel values to make it work.
I wrote this mini tool to solve such issues. It scans all of notes in various pitch, then replace with fitting labels. Now, it can be dealed quickly.