Billy holding up his custom-made AToner in the "Stompland" video
This is a build of the 4ms Atoner. It's an odd pedal that is capable of overdrive, fuzz, octave and pitch shifting effects. Billy's version features the following controls:
Speed (Unclear if this is Envelope Speed or LFO Speed, probably LFO Speed),
Volt (most likely a voltage control to simulate a dying battery),
Rickle (a custom control for this pedal mentioned on the 4ms site),
Featured in a video of Billy's huge collection of guitar pedals called Stompland.