Once in a great while, a midi file will cause the problem to malfunction. It's not often, but when it does it's a real pain in the butt. The only solution, usually, is to reboot the PC.

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)