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The System 90 signal path is divided into two types of signals: audio signals and control voltages.
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The audio signal is the sound that is produced. The audio signal path starts at a sound source such as a DNA
Symbiotic Waves oscillator, Waveforms oscillator, LFO running at audio rate, or a self oscillating LPG module. The
audio signal is then patched through other modules used to shape the sound such as mixers, filters, and
amplifiers.
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Control voltages (CV) manipulate the audio signal in several different ways.
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Gates are represented by a high or low control voltage. A gate can be generated using a square or
pulse wave from an oscillator or LFO, or by using the GATE output from the Midi2 module. A gate
can be shaped using an envelope generator to control the attack, decay, sustain, and release of
the gate. The modified gate signal can then be sent to any CV input on the Foundation.
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A second use for control voltages is as a modulation source. For example, a control voltage
from the CV output of the Midi2 module patched into the 1V/O input on the Waveforms
oscillator module controls the frequency of the oscillator based on the midi note received.
The LFO2 module provides two separate low frequency oscillators that make perfect control
voltage modulation sources. Audio signals also make a great control voltage source for
oscillator FM (frequency modulation).
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As always, experimentation is essential to getting the most out of the System 90.!
