via this auction
"The pedal includes:
-Waveform. Similar to distortion.
-Filter with Frequency and Brilliance sliders.
-Sample/Hold effect. Similar to a small sequencer.
-Phase. A great sounding phase shifter.
-Envelope with separate attack and decay sliders
-Sub-Harmonic with sustain and percussion switch
The colored rocker switches turn the effects off and on. They can be used separately or in combo.
The foot control allows you to preset the effect on that you want then turn them off and on as needed."
Pic of the inside below.
SN 1797