BOSS OC-20G Poly Octave effects pedal from 00's GK Effects Series: uses GK p'up!

Boss SL-20 Slicer Audio Pattern Processor Pedal + PSA Adapter Tested

9 Fender And Boss Guitar Effect Pedal Lot

Boss EQ-20 Advanced EQ pedal

Excellent Boss GK OC-2OG Octive Poly Pedal Processor

Vintage BOSS PQ-50 - 4-Band Parametric Equalizer Audio Processor - WORKING

BOSS GP-20 Amp Factory Twin Pedal GUITAR AMP PROCESSOR w/Original Box +

Boss WP-20G GK Wave Processor Guitar Effect Pedal RARE VERY NICE