A Voltage Controlled Oscillator module from Moog.

Released around 1974, the 921 was a more stable version of the earlier 901 and 901b oscillators. Used in the modular units 15, 35 and 55.

The 921 features a frequency range of 0.1 - 40 000 hertz. It can output sine, triangle, sawtooth and variable-width-square waveforms simultaneously. Waveform clamping by S/V trigger signals is also available.

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