This screen permits selected tracks to be muted. It shows a list of track names for the currently loaded tune, with a check-mark to the left of each track name.
Simply place a check mark beside each track that you wish to become silent, and leave the check mark empty for those tracks you wish to hear.
Then click the OK button. The muted tracks will not be heard, as a MIDI Main volume event of zero has been placed at the start of these tracks.
To reverse the muting, uncheck all tracks and click OK.