Anyway, if this is a Super Articulation bagpipe voice, the tremelo would be initiated by a footswitch, just like fret noise is made with many of the S.A. guitars and inhaling breath sounds are made with many S.A. saxes and wind instruments. So if you don't like the tremelo on the bagpipe, you can program a footswitch for some other effect to make it sound realistic, like wah wah or to add distortion.

Beakybird