Lublin

A 6 HP dual DC-coupled VCA with an exponential response, built on Blackmer cells, whose gain limiting keeps it from opening beyond 0 dB. Each channel's ping input triggers an internal envelope modelled on vactrol decays, with three shapes chosen by its RESP switch: shortened, natural or prolonged. A multi-colour LED per channel shows the output level.

Key features

• Two independent channels: IN, EXP (exponential CV, 0 to 8 V), PING (trigger or gate, at least 4 ms) and OUT
• With nothing patched, the knob alone sets the gain from -90 dB to 0 dB; with CV at EXP it scales that CV
• EXP normalled to an internal 8 V unless PING is used
• Pinged envelope opening the VCA to 0 dB, riding on top of the CV, its tail set by the knob
• RESP: SHORTENED, NATURAL, PROLONGED decay shapes
• PPM level LEDs: green up to 10 Vpp, yellow above, red over 16 Vpp
• Rear trimmer setting the CV saturation level (calibrated to 0 dB)