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6.97 VCO (Voltage Controlled Oscillator) 155
Typical Use
A VCA is mainly used to apply an amplitude envelope to a signal. An ADSR can be used to supply
the appropriate gain signal.
Figure 96: ADSR as Gain Signal to VCA.
Figure 97: VCA in Ring.
A VCA can also be used to obtain a ring modulation effect. In this case the gain signal is a sine
wave around 50 Hz.
Note: Since a multiplication operation is involved, the order of the inputs is not important. For
the same reason, if one of the two input signals is null, the output will also be null.
6.97 VCO (Voltage Controlled Oscillator)
The VCO module is an oscillator used to generate signals of
different frequencies and waveforms. This module has 3 mod-
ulation inputs and 1 output.
The sum of the first two inputs controls the pitch of the out-
put signal. Each of these two inputs is multiplied by its respec-
tive gain knob, mod1 or mod2. The third input controls the pulse
width for the pulse wave subject to the setting of the PWM knob.
155


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