Alesis ANDROMEDA A6 Reference Manual page 92

Chapter 3: Basics of Analog Synthesis
5. The keyboard is also responsible for gating the envelopes. In essence, this is
really what causes the synthesizer to make a sound. When the envelopes start,
they "open" and allow the filters and the output section to pass sound from
the oscillators:
6. But what about pitch bend and vibrato controllers? Pitch bend routes a wheel
directly to the oscillators so as to allow you to manually vary their pitch.
Vibrato uses a wheel that sends a variable amplitude (amount) to an LFO that
in turn varies the pitch of the oscillators up and down slightly:
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