Two guitar pedals. - DOD FX 13 Modulator Gonkulator The FX13 is a distortion and ring modulator effect in one. Four controls for shaping sound include “Suck” (distortion output level), “Smear” (ring modulator output level), “Gunk” (distortion gain), and “Heave” (overall output level). The effect is truly wild and like nothing you have heard. The Deep Signal Studios Gonkulator has a carrier frequency control knob modification. Original pedal from 90's!!! - Ibanez PDM1 Programmable Modulation Delay DCP series. This kind of pedal was also used by Carlos Santana. From 80's. Instructions included.