4 Functions in one 2MU module

The GMS-782 Dual Voltage Controlled Low Frequency Oscillator/VC Amplifier provides low frequency triangle, sine or square waves for use as modifiers or triggers for complex evolving synth patches. Two functions, commonly used together are combined in each channel to produce a versatile voltage controlled waveform generator. The LFO has a wide range from subsonic to low audio in two ranges and provides a trigger function to reset the oscillator to a known state. The voltage controlled amplifier has a selector switch allowing one of the three oscillator waveforms or an external input to be selected as its input. The output is a function of the front panel level control summed with the voltage control input.

TRIGGER- When a control signal with a rising edge is presented to the Trigger input, the oscillator is reset to 0 Volts output and the waveform starts rising in the positive direction. The trigger input signal should be a 0 to +5 Volt signal. The length of the trigger pulse is not important.



Technical Specifications

Frequency Range - High Range
0.015Hz to 400Hz

Frequency Range - Low Range
0.0015Hz to 40Hz

Waveform Voltage Range
10 Volts Peak-to-Peak

Frequency Control Voltage Standard
Exponential 1 Volt per Octave

Amplitude Control Voltage Standard
Linear 1.0 V per Volt

Envelope Control Voltage Range
0 - 10 Volts

Gate Control Voltage Range
0 - 5 Volts (1.8 Volt Threshold)

Typical Input Impedance
100K Ohms

Typical Output Impedance
1K Ohms (short circuit protection)

Module Power
+15 Volts 25 mA., -15 Volts 25 mA.

Module Size
Panel height - 8.75 inches (222 mm);
Panel width - 4.25 inches (108 mm);
Depth (behind panel) 2.1 inches (53 mm)



We produce electronic synthesizer modules in the two most popular formats, MU (Moog compatible 5U) and EU (Eurorack compatible 3U). A wide range of voltage controlled modules including oscillators, amplifiers, mixers, envelope generators, special effects units, wave generators, filters, power systems and cases allow users complete freedom to configure any desired electronic music instrument.


Grove Audio builds microphones, preamplifiers, equalizers, compressors and other professional audio equipment for performance and studio use. We build units in popular formats such as 19 inch rack mount and 500 series 3U modules. We can also produce custom designs on request. Contact us for a consultation.


You can explore all of our products, download spec sheets, and purchase our products in the Grove Audio Synth Store. You can also learn about our periodic specials and new product introductions. Click the button below to go directly to the store.

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Grove Audio has been manufacturing professional recording and modularized electronics for musicians and performers since 1995.