RichAM is a synth mode for the 201 Pocket Piano. It’s an amplitude modulation synthesizer. It has a clean, yet complex low end, making RichAM ideal for bass sounds. It’s great for plucky notes in the higher registers too!

The knobs control the following:
Knob 1: Envelope
Knob 2: Modulation amount
Knob 3 : Voice preset selection