This is the IdiotBox Effects Super Bass-o-Matic '76 envelope filter pedal. Here's a rundown of the controls:
-SENS: This sets the threshold level for the filtering effect. Turn it clockwise to trigger earlier. Turn it counter-clockwise to trigger later.
-BLEND: This is a blend between the dry signal and the wet/effected signal.
-FREQ: This adjusts the width of the frequency band of the filtering.
This Super Bass-o-Matic is in excellent condition. The electronics work perfectly. The pots, jacks and stomp switch are all clean and quiet. You can power this with a 1Spot or Boss PSA-style ac/dc adapter, or with your standard 9-volt pedalboard power supply.