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"System consists of the following.
1 x Case & Power Supply
1 x 921 Module is a control voltage processor wich runs associated 921-B oscillators through internally wired connections.
Two voltages are generated : One for frequency control (3 Inputs) One for rectangular wave duty cycle control (2 Inputs)
2 x 921-B module provides 4 waveshapes : Saw / Triangle / Pulse / Sine
Frequency : semi-fine tune over 2 octaves. Picth selection over 5 octaves + LOW position
2 linear modulation input : A.C Modulate / D.C Modulate. 1 Synchro input
2 x 911 Envelope Generator
This module produces a single voltage contour whose time/voltage variation is determined by pot T1, T2, T3 and a time constant sustaining level pot (Esus).
T1 : Rise time 2ms to 10sec
T2 : Initial Decay Time 2ms to 10sec
T3 : Final Decay Time 2 ms à 10sec
Esus : sustain 0 to 5.5V
1 x LP Filter
Fixed control voltage, Frequency Range (about):
1- 1Hz to 5kHz
2- 4Hz to 20kHz
3- 16Hz to 80kHz
Regeneration : Resonant peak will break into oscillation at clockwise settings of the regeneration pot 3 modulation Inputs.
1 x VCA
902 VCA module is a differential Input / Output circuit which a gain of 2 (6dB)
Switch for select between Linear mod or Exponential mod
3 modulation inputs"
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