GMS-714 Quad VCA

4 voltage controlled amplifiers with switchable linear or logaritmic response. The module offers panning capability.

The GMS-714 Quad Voltage Controlled Amplifier/Gate contains four high quality VCA devices in a 1MU panel. Each amplifier can be used with an external control input to produce a change in amplifier gain from infinite attenuation to a gain factor of 1. The control curve can be set for a linear or logarithmic response to the input control voltage. Normalization of inputs, reversible attenuators on control inputs, and a built-in output mixer permit various stereo panning tasks to be performed.


The module contains four separate high quality voltage controlled amplifier channels. Each channel has an associated control voltage input that passes through a reversible attenuator. The attenuator allows the control voltage to be prescaled from zero up to twice the applied level. When the attenuator control is positioned to the left of 0, a greater negative voltage on the control input will produce higher gain values approaching a gain of 1 in the associated amplifier channel.

The control voltage response curve is determined by a switch on the attenuator knob. When the knob is in, the response curve has a linear action. When the attenuator knob is pulled out, the response curve has a logarithmic action. This response is similar to the logarithmic taper on a normal volume control.


Input normalization and an output mixer allow for the use of the module as a mono or stereo voltage-controlled panner. Channel 1 and 3 are mixed and output on the left mixer output. Channel 2 and 4 are mixed and output on the right mixer output if a plug is inserted in the left mixer output. If no plug is inserted there, the right mixer jack provides the outputs of all four channels mixed together.

  • 40 mA +15V
  • 40 mA -15V
  • 1 mA 5V
  • 79 mm deep

This Module is currently available.

$229 Price in € submitted Nov 21st 2012, 02:48 by CFF3 | last Change Apr 27th 2017, 03:47 by analogdarkside