Quad mixer VCA

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Product code SIQM
Category Modular synthesizers
Brand Seismic Industries
Availability no
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The Quad Mixer module is  a voltage controlled mixer based on four high quality VCA circuits using the well know gain cells from THAT Corporation. The outputs of the VCA’s are all summed together and presented at the “MIX OUT” jack. Each channel has a potentiometer for it’s manual gain setting. Also on every channel is a CV input with adjustable attenuation to modulate the gain.

The “Common CV” input addresses all 4 channels together. The “Common CV” input is not attenuated.

The circuits also accept DC voltages on its signal inputs to process DC or very low frequency signals.

The circuits are set to -110dB gain when the gain potentiometer set to zero and no external CV is applied.
Sensitivity of the CV inputs is set to 95mV/dB.

Maximum voltage level before clipping is about 20Vpp.

All I/O signals are accessible on an pinheader for prepatching when built in.
Additionally also all four VCA output signals are available to route to a breakout module (soon available) that makes the module a quad VCA module.

Tunable Parameters:

  • 4 x channel gain control
  • 4 x channel CV attenuation


  • 4 x signal inputs
  • 4 x CV inputs
  • 1 x common CV input


  • +12V 27mA / -12V 26mA


  • Width: 21 TE (106.3mm)
  • Depth: 13mm

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