Hello i have an mc-505 groovebox that i would like to use with an yamaha drum machine since i don't like the drums in the 505. I have midi out of the 505 going to the "in" of the drum machine and can control it from the 505. I can't get the tempo's to sync up right. I will set both machines at 120 bpm but after a few loops the timing is thrown off. How do i get the timing (bpm) to sync up??