Erica Synths Black Ring-Xfade

The Erica Synths Black Ring-Xfade is an extremely versatile module for sound shaping. It consists of two unconventional ringmodulators/waveshapers, a crossfader that works both for audio and CV and a VCA. Unlike conventional ringmodulator that works only with a signal present on both signal and carrier inputs, the Black Ring-Xfade passes through the signal without alteration, if no carrier is present, but low level signals on the carrier input result in unique waveshaping. Add the crossfader between two ringmodulators (or for an external signals) topped up with the VCA, and you have an amplitude modulation powerplant for your modular system.

Features
Dual ringmodulaotr/waveshaper
Carrier level adjustment
Voltage controlled crossfader
Manual and CV control over crossfade
Selectable AC (audio) or DC (control voltage) coupling
VCA with selectable bias

Technical specifications:

Audio level
10Vptp
CV level (full span)
-5V - +5V
Power consumption
+38mA, -32mA
Module width
10HP
Module depth
35mm