It sounds to me like it has a triangle wave LFO and if you plug a dummy lead into the dry output the main output goes wet only and becomes a cool (if weird) vibrato. It got me wondering whether it would be possible to filter the LFO a touch to give an optional different character to the chorus/vibrato.
My thinking is that the depth pot is probably a voltage divider so putting a cap between the output of that and ground shouldn't be too hard, does this sound right? If it sounds good I'd try and find a place to add a switch so I can go back to the original sound.
Does anyone know what it's based on and if there's a schematic to check my guess?