9710 VCA-Mixer-Noise Source

Combines 3 VCAs, a White Noise Source and full function ADSR/LFO Envelope Generator.

At the highest level, you can use the 9710 like a traditional VCA but with the added convenience of a built-in Voltage Controlled Input Submixer and ADSR Envelope Generator. This configuration of elements allows a couple of signals to be mixed together before being processed by the VCA which is controlled by the ADSR. It would ordinarily require three or four modules and a handful of patch cords but is embodied as a single element in the 9710.

And the versatility of individual modules is not sacrificed because patch cords can be used to override the normalization and access progressively lower level functional sub-groups or even the individual elements.

The "L" and "R" VCAs are normalized for source pan mixing (morphing) either with a knob or a single CV applied to the CVL input but they can also be accessed as individual VCAs.

The "A" VCA uses a 1496 type Balanced Modulator IC and normally it's Modulation source is an exponential (10dB/V) output of the ADSR. It can be used as a Balanced (Ring) Modulator by patching an external signal source into the CVa (Modulation) input, which overrides the ADSR and expo circuit for a direct linear input.

Many artists prefer linear dynamic response when building percussion sounds because they have much more "punch" than the technically correct exponential response. Patching CVa to the ADSR output bypasses the expo converter for linear ADSR response.

The Envelope Generator is a full-function ADSR with Attack (500uS - 5Sec), Decay (2mS - 7Sec), Sustain Level (0 - 10V) and Release (2mS - 7Sec) controls. Separate Trigger and Gate inputs allow re-triggering. The Cycle switch enables self-triggering for a Low Frequency Oscillator function with independently adjustable rise and fall times. When being used as an LFO the Gate inputs turn the oscillator off and on and Trigger inputs sync it to an external source. The front panel LED brightens and dims to indicate Modulator output.


  • 29 mA +15V
  • 30 mA -15V
  • Ø 4.00 (1 Votes) Average Rating

Module is available as a DIY project only.

This Module is currently available.

$99 Price in € submitted Jan 19th 2013, 13:00 by Squiggletronics | last Change Nov 24th 2017, 23:20 by