MODULE FUNCTIONS
921A Oscillator Driver
Allows one set of control voltages to determine the pitch and rectangular waveform widths of
the 921B’s.
921B Oscillator
Produces the basic waveforms for audio or control purposes, with expanded facilities for
modulation and synchronization.
921 Oscillator
Produces the basic repetitive waveforms for audio and control purposes, with expanded fa-
cilities for triggered waveform clamping and waveform level variation.
923 Filters / Noise Source
• Lowpass Filter - Attenuates that portion of the signal’s frequency spectrum that lies
above the cutoff frequency.
• Highpass Filter - Attenuates that portion of the signal’s frequency spectrum that lies
below the cutoff frequency.
• Noise Source - Produces white and pink sound for audio and control purposes.
902 Voltage Controlled Amplifier
Shapes the amplitude of a signal in response to any control signals.
904A Voltage Controlled Lowpass Filter
Attenuates that portion of the signal’s frequency spectrum that lies above the cutoff fre-
quency. Cutoff frequency responds to changes in control signals.
907 Fixed Filter Bank
Divides the audio spectrum into ten separate bands, and allows individual attenuation of each
band.
911 Envelope Generator
Produces a wide range of transient control contours whenever it receives a trigger signal.
952 Keyboard Controller
Produces two independent control and two independent trigger signals in response to de-
pressed keys.
995 Attenuators
Permits any signal to be reduced in amplitude.
Mixer Panel
Combines audio or control signals, and produces two complementary outputs.
Reversible Attenuator
Permits any signal to be reversed in polarity and varied in magnitude.
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