The dual looper consists of two heavily modified voice recorder circuits that can loop simultaneously and are then mixed together to one main out. Each side also has a trigger input which can trigger the loops with the gate from a sequencer or any ~5v pulse.
The left are right sides are identical, each including:
built in mic
switch-activated pitch sweep
switch-activated light resistor to control the pitch/speed of the loop with light
trigger input via 1/8” jack
It's almost too much fun.