 Additionally, the Omni-2's Bass voice utilized a single oscillator waveform circuit coupled with a preset 2-pole, Low Pass Filter and preset Attack Decay Release (ADR) envelope generator.A Staccato switch controlled the Bass section's envelope contour Decay time vs. the original Omni Bass voice ADSR assignment via its Synthesizer section.Further, the Omni-2 Bass section had its own audio output on the rear panel in addition to the Strings and Synthesizer outputs; separate amplification of these three distinct outputs was referred to in ARP literature at the time as "Tri-phonic".