Doepfer A-101-2 Vactrol Low Pass Gate

Doepfer A-101-2 Vactrol Low Pass GateA 101 2 is a vactrol based combination of Low Pass filter (LP) and VCA and was inspired by the Buchla module 292. The term "Low Pass Gate" was created by Don Buchla and stands for a module that can be switched between low pass and VCA. The control (manually and via external CV) is responsible for frequency in the low pass mode and for loudness in the VCA mode. Additionally a combined mode LP+VCA is available. In this mode the sound becomes more dull

In this state

and a much broader range of tonal possibilities using the Zero Point Control

tilts the spectrum

or comb filtered vocoder-esque timbres

Min output

The processing section is composed of a waveshaping section (white) and a last stage of amplitude modulation (red): the first provides further degrees of modulation using two parallel wave-shapers and includes PWM

ready to be excited by envelope clicks

Power: 260mA @+12v / 60mA @-12v

The 4 input mixer and 8 outputs make feedback loops and self oscillation patches extremely easy and almost required

Power: 185mA @ +12V / 30mA @- 12V

and can therefore become a super complex LFO

The mix surgeon's best friend is now a powerful effect in your eurorack system