on my technics I permanently disable any accompaniment parts I do not want with local off.
If you save this setup in a user midi preset, you can switch back and forth muting any part you want permanently from any preset, floppy or hard disk style load just by selecting the appropriate user midi preset. This has the advantage that it always works no matter what other settings or buttons you press on the panel.
Maybe the same principle can be applied to your sd1?