Note: Auction links are affiliate links for which the site may be compensated.

via
this auction"It was commonly sold with the Axxe model, however could be used with any of ARP's synthesizers, or any analog synthesizer (Moog, EMS, Sequential Circuits) with the necessary 1v/octave CV output and external audio input connections. The oscillator has 4 different octave settings and 4 unique waveforms that can really fatten up your sound.

Features:
Oscillator
Pitch Range: Bass 16', Tenor 8', Alto 4', Soprano 2'
Waveform: Brass, Hollow, Reed, Fuzz
Effects
LFO speed
Vibrato Depth
Vibrato Delay On/Off
Pitch Bend knob

Tuning pot
Power Switch
Connections
CV in and out
Gate in and out
Trigger in and out
Audio in and out
LFO CV output"