The EXP came in 4 different versions 

1. EXP1 : Expression pedal for the Retrovibe mk.3 (to control Speed), Delay Llama Xtreme (to control Delay Time), Ripply Fall (to control WaterFall Speed and Depth) and LucyDreamer Supreme (to control Dry/Wet Mix and Boost Level). This expression pedal is a common 10k expression pedal that you can also use for other uses
2. EXP2 : Expression pedal for the Delay Llama+ (to control Delay Time). The same expression pedal can be used to control Depth on the Big Chill
3. EXP3 : Expression pedal only for the Big Chill (to control Speed 2)
4. EXP4 : Expression pedal only for the RetroVibe mk.2 (to control Speed)

If you own a version of one of the above pedals corresponding to either the EXP2 ,3 or 4, please reach us for availability.