This patch requires some manual control.

The start-up sequence:
Start Recorder (optional)
Set Progress Steps = 1
Start Progress
Raise chords mix level
Raise master mix level
Start Simple Clock

The performance sequence (after opening drone):
Set Progress Steps = 4, play for 1 cycles
Set Progress Steps = 8, play for 2 cycles
Set Progress Steps = 4, play for 1 cycle
Set Progress Steps = 2, play for 2 cycles
Set Progress Steps = 1, play through fade-out

The performance should last a little longer than 8 minutes.

The patch as-is requires the non-free Hot Bunny module, but any random signal generator will likely work as well at controlling the Bernoulli gate for the bass line.