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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

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