Doepfer A-101-2 Handleiding

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doepfer System A - 100Vactrol Lowpass Gate A-101-2

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1. IntroductionModule A-101-2 is a vactrol based combination of

Low Pass filter (LP) and VCA. Additionally a combined

mode LP+VCA is available. In this mode the sound

becomes more dull as the loudness decreases.

The A-101-2 was inspired by module 292 of Don Buchla.

He also intruduced the term "Low Pass Gate" for this

combination of functions.

The function of the module is controlled by a manual

switchor by two gate inputs.

In principle the A-101-2 is a 12 dB low pass that can be

switched to VCA or a combination of Low Pass and

VCA. The controlling elements for frequency resp. loud-

ness are so-called vactrols. A vactrol is a combination

of a light depending resistor(LDR) and a light emit-

ting diode(LED) both put into a small light-proof case.

Vactrolbased circuits are known for their soft low-

distortion sound. For details about vactrols please use

the corresponding link in the A-101-2 info page on our

web site www.doepfer.com.

Frequencyresp. loudness is controlled manually and

by two control inputs.

The audio input is very sensitive in filter mode to obtain

distortion effects if desired.

The resonancefunction "colors" to the sound and is

adjustable all the way up to self-oscillation.

In contrast to the Buchla design the A-101-2 offers the

resonance feature, attenuators for both CV and audio

input, and two gate inputs to control the function of the

module in addition to the manual toggle switch.

Product specificaties