I call this pedal the G-91 destroyer it’s based off of a DOD 250 preamp.. it’s modified to take diodes of your choice. I will throw in some extra diodes if you would like… changing the diodes will change the feel and tone of the pedal… I placed a OA-91 a beautiful rare $ glass germanium diode with a 1n695 germanium diode and it gives this pedal a one of a kind authentic tone… I use high quality terminals that work great a set of tweezers or very small pliers makes swapping diodes easier… but you won’t really need to because the pedal sounds great but its always there if you want to play around. The pedal has a volume level and gain knob the gain knob is bland until the last 30 degrees of the turn this is common even on the original pedal that it’s based off of. Any questions just message me.