[Al_]

Thanks for looking into this. I've used my internal midi synth, plus an external midi keyboard with the same results. I'm happy to let this problem go since I have a workaround. If I ever figure it out, I'll come back and post what I found.

BTW, this piece (Beethoven's Trio IV in B flat major) is from a midi file I downloaded from the internet. My son plays cello, and he practices to this with the cello part muted. Very handy way to get in lots of practice without relying on other people.