Just trying to work out a way now for a some Bagpipe UserTracks, you can generate the Drone as a separate track and Notes as another allowing the note change but same drone..

Here's some samples from actual Highland Pipes.

Pipers_Notes.mp3

Pipers_Drone.mp3

Pipers_Mix.mp3

Though I don't think the 3/4 is working yet in UserTracks.

Ya gotta love em', Bon Scott played em' in It's A Long Way to The Top.