I've been making some instrumental songs with the song sequencer on my WK-7600 and because I really like they sound, I wanted to upload them online. However, after saving everything as MIDI files on my SD card, I realized that some tracks will play back as a whole other instrument. For example, in one of my songs which is really percussive, the drum set track turns into a violin track and the song sounds like nonsense. Is there anyone who can tell me if I did something wrong, or if there is something I can do different? Note: I never have this problem for songs that only consist of a piano track. It usually happens with drum tracks.