I tried to play an audio file and overdub some tracks with GS, and it worked fine at the beginning. But when I tried some fast tempo song, audio track went out of sync in the middle of the song. And if I pause it and play again, then audio track and GS midi track sync again. And after tens of seconds, out of sync, pause, sync, ,,,,, like that. I use cakewalk, 2408, and giga studio 160, and fast PC. Do I have to use some other sequencer or something?