On Wed, 17 Feb 2021, 2:24 pm prea, <prea@...> wrote:
As @squishy suggested, you can set the volume to 0 for any track in the QY that you don't want to make the QY100 tone generator "play" (QY100 manual about page 130 in SONG mode).
Another solution can be changing the volume via SYSEX, IIRC sending F0 43 10 4C 08 0B F7, where can be 0 to F for the 16 song tracks and 10-17 (hex) for the pattern tracks.
Another solution is setting LOCAL OFF, see around page 247 on the QY100 manual, or setting ECHO BACK to OFF.