Electro harmonix Electric mistress Deluxe vintage flanger and Sequential circuits Prophet 600.

Electro Harmonix Q-Tron and the Korg R3 in action.
The Q-Tron is the recreation of the Vintage Mu-TRON III , it’s an Envelope Follower with a multimode resonant filter , it’s an auto-wah.
The pedal reacts to the volume of the signal processed and control the sweep of the filter.