BOSS CE-1 CHORUS ENSEMBLE Drum Synth this is the Optivalve -

this is the Optivalve - a valve (tube) optical compressor/limiter in pedal form

Vintage Made-in-Japan compressor

This one comes with a pair of photos

Demo of the same model below

broken tapes or failing motors of the originals

BOSS CE-1 CHORUS ENSEMBLE Drum Synth this is the Optivalve -The original chorus pedal: the Boss CE 1 Chorus Ensemble dating from the mid to late 70s. A stone cold classic effect: guitar, keys, synths, bass, mix this is a great sounding vintage chorus.. See the full Boss CE 1 technical run down at BossArea For sale in full working order, and very good cosmetic condition it's built like a tank and has only minor scuffs scratches to the casing and some scratches on the face; knobs are all original. See the