An input into part of the synthesizer that allows that bit to be modulated by another part of the synth. For example there is a control input in the amplifier which controls the level of amplification. If a very slow sine wave (an LFO) is patched into this input then the sound will slowly get louder and quieter. If an LFO was patched into the control input of the oscillator instead, then the sound would go higher and lower in pitch....
Omni-2
"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.