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Alpha Duo: Stereo/Mono VCA, Ring Mod and Overdrive

Alpha Duo is a stereo precision VCA with ring modulation, overdrive and distortion.

Alpha Duo's VCAs have three modes:
1) Two quadrant, for classic VCA behaviour
2) Four quadrant, where the VCA responds to both positive and negative Gain CVs. This creates a classic ring modulator.
3) In four quadrant separate (4S) mode, each of the two VCA channels is controlled by separate gain CVs, turning Alpha Duo into two independent VCA/ring modulators.

Alpha Duo also features three drive modes.
1) In Drive Mode zero the overdrive circuit is not active, giving a clean signal.
2) Drive Mode One is a tube style soft overdrive. Like a tube, the positive and negative parts of the waveform are distorted differently, producing a pleasing, warm fuzz.
3) Drive Mode Two is a harder clip – more like a transistor amplifier – for a harder edged distortion.

Alpha Duo's signal path is DC coupled, so it's great for processing CVs as well as audio.

Specifications:

Width: 10HP
Depth: 22mm excl. power cable. Approx 32mm inc. shrouded power cable
Power Requirements:
+12v: 200mA
-12v: 50mA
+5v: 0mA
Inputs:
Signal (Zero attenuation): ±5v nominal, ±12v max
GainCV [Zero attenuation]: ±5v nominal
Pan CV [Zero attenuation]: ±5v nominal
Outputs:
Dual/Stereo: ±5v nominal, ±11v max

Documentation

User manuals can now be found on the User Manuals page.

Due to ongoing improvement and development, the appearance and specifications of all products are likely to change.