The preset below is configured for control like the previous HALL algo example. HotSwitch snaps from a 4 BAR DECAY to FREEZE. The expression pedal sweeps the same range. This one is good for illustrating expression pedal mixing over DECAY / INF / FREEZE. Try mixing the input & drone near the top 1/3 of pedal travel (towards the toe). The relatively deep modulation gets overlaid repeatedly into the background drone.