For sale is a clone of Culturejams Shoot to the moon tremolo. A highly versatile circuit offering all the tremolo one can need. 
Its potis let you manipulate rate, depth, the waveform and the overall volume (it has plenty on tap letting you boost the signal quite a lot). 

The pedal is housed in an old Märklin transformer enclosure from the sixties or seventies. 

I‘ll attach a video of the circuit. If you require a video of this specific pedal, feel free to ask.