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Wednesday, October 21st, 2020 09:06 pm

Synth Glossary

Analog Synthesis:
This term is normally used to refer to the tradional synthesis model used by analog synthesizers in the 1970s. It is also known as subtractive synthesis. It involves oscillators, the outputs of which are mixed together and fed into a filter (where certain frequencies are subtracted) after which they are fed through an amplifier. The amplifier and filter are normally also driven by envelope generators....


"The ARP Omni-2 is an improved version of the popular Omni. It features all- electronic switching, single/multiple triggering and a separate bass synthesizer. The Omni-2 is actually three separate instruments in one package - 1) a highly evolved string chorus, 2) polyphonic synthesizer section and 3) separate bass synthesizer. All three sections can be played simultaneously for impressively-rich orchestral effects....The Omni-2 has controls to balance the volume of each section, selectable waveforms and chorus phaser controls. Each section has its own output so that the Omni-2 can be played in stereo or even dramatic 'triphonic.'"----[from ARP's promotional Omni-2 brochure courtesy of Kevin Lightner]

The Omni keyboards are string synthesizers with four separate voices (bass, cello, viola, violin, each independently switchable) and a bass/synthesizer section. The string section has its own variable speed LFO, and attack/release envelopes. The synthesizer section has a VCF and its own ADSR envelope. The bass/synthesizer split is set to the lower one and a half octaves. The Omni (model 2300) was ARP's best selling intstrument. Unlike the original, the Omni-2 has single triggering so that when any note is held down the VCF and VCA envelopes will not re-trigger. The original Omni had multiple triggering so that every time a key was depressed the envelopes were triggered.

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