doepfer a-130-4 quad vca price : $115.00
a-130-4 quad vca: vintage edition price : $121.00

module a-130-4 contains four linear vcas with a common level control section for all four vcas. it can be used for all applications of simultaneous amplitude/level control of up to four different audio or cv signals. a-130-4 is the replacement of the no longer available module a-132-2. compared to the a-132-2 the width has been reduced from 8hp to 4hp.

the module has these controls and in/outputs available:
control man.: manual control of the amplification
control cv: attenuator for the control voltage applied to socket cv
sockets in 1...4: vca inputs 1...4
sockets out 1...4: vca outputs 1...4

application examples:
simultaneous amplitude/level control of up to four different audio or cv signals
polyphonic application 1: simultaneous control of the frequency modulation depth of 4 vcos (quad-lfo a-145-4 or quad-vclfo a-147-5 > a-130-4 > fm inputs a-111-4), see patch example below
polyphonic application 2: simultaneous control of the pulsewidth modulation depth of 4 vcos (quad-lfo a-145-4 or quad-vclfo a-147-5 > a-130-4 > pwm inputs a-111-4), see patch example below
polyphonic application 3: simultaneous control of the frequency modulation depth of 4 vcfs (quad-lfo a-145-4 or quad-vclfo a-147-5 > a-130-4 > individual cv inputs of a-105-4 on jp4)
simultaneous control of quadrophonic signals

technical notes:
the maximum amplification for each vca is about 1 ("man." control fully cw). even with an external control voltage applied to the cv input the maximum amplification is limited to 1.
the module is equipped with two internal connectors (pin headers with 4 pins each). pin header #1 can be used to normalize the four inputs to other modules (e.g. quad lfo a-145-4 or a-147-5, quad adsr a-143-2). pin header #2 can be used to connect the four outputs to other modules.
the max. level at the vca inputs without clipping/distortion is about 20vpp or +/-10v.



this module has a maximum current draw of 30ma. it requires 4 hp/te worth of space to fit in a eurorack frame.