If I change the voice on my Yamaha PSR550, while still holding down a note/chord, I hear a little glitch when I change. My Roland EM20, on the other hand, does not have this glitch. It changes voices as soon as I hit the next note/chord (which is as it should be). Sounds like a bug on the Yammy keyboard. Will see what happens if I change configuration while holding down a chord.
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