I bought a midi file from Hittrax. I used Sonar4 to open the file. I am using the TTS1 to playback the file. Everything works fine unless I want to change the instrument of a certain track. I can select a different patch during playback and it will switch, however, after I stop and restart the song, the patch switches back to the original instrument. I cannot find anything in the SYSX view nor the event view that would explain why this happens? Thanks in advance.