Paia 9720 Assembly And Using Manual

Dual VCO w/Modulator
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The 9720 Dual VCO w/Modulator features two independent VCOs,
each with a chromatic range of 10 octaves from 16Hz to 16kHz at a
+/- 1cent pitch error. Total range of each oscillator is from 1 cycle/
minute (0.017 Hz) to 100 kHz so either can be used as wide range
audio source or super slow multi-waveform LFO. Temperature
stability is equally extraordinary due to a novel exponential converter
that provides more accurate temp tracking than conventional designs
without the use of temperature compensating resistors.
Oscillator A has 5V p-p outputs for Ramp, Pulse (w/Width modula-
tion), Triangle and Sin waveforms. The built-in Glide Processor
provides slew rates from milliseconds to several seconds and a
convenient toggle switch transposes down from normal audio outputs
to LFO mode. The Pitch knob sets initial pitch over a 3 octave range.
The Sync input provides for "Soft Synchronization" to an external
Oscillator B is very similar to Osc A but subtle differences optimize
the flexibility of the pair. There are outputs for Ramp, Triangle and
Pulse waveforms. A panel control for initial Pulse Width works in
conjunction with the PW CV input that is normalized to the Modulator
output. An auxiliary 1V/kHz Frequency Modulation input allows for
complex FM timbres from just a single module.
The Modulator is an Attack/Release Envelope Generator that has a
separate Trigger input for A/R envelopes and Gate input for A/R with
Sustain (ASR). Attack time is adjustable from 0.5ms to 2 seconds,
Release time from 1ms to 4 seconds. The Cycle switch allows self-
triggering for an LFO with independently adjustable rise and fall
times and a range from a cycle every few seconds to over 100Hz.
The Gate and Trigger inputs also work when in Cycle mode - a Gate
input turns the oscillator off and on and Trigger inputs syncs the
oscillator to an external source. The front panel LED brightens and
(c) 2000 PAiA Electronics, Inc.
Model 9720
Assembly and Using Manual
dims to indicate Modulator output.
9720 VCO
audio source.
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