Doepfer A-130-2 Dual VCA
Dual-mode VCA for audio shaping and CV control
4 HP Eurorack module
The A-130/A-131 are voltage-controlled amplifiers that provide voltage-controlled amplification of audio or CV signals. The A-130 uses a linear response curve while the A-131 uses an exponential (logarithmic) response, making the A-130 ideal for CV processing and the A-131 ideal for natural-sounding audio amplitude control.
Features
- Linear response curve (A-130) or exponential/logarithmic response curve (A-131)
- Two audio inputs each with individual attenuator knobs
- Two CV inputs: CV 1 (direct) and CV 2 (with attenuator)
- Gain knob sets overall amplification offset, shifting entire VCA response curve upward
- Output attenuator for total volume control of combined audio output
- Effective CV range: 0V (no amplification) to +5V (maximum amplification)
- CV 1 and CV 2 voltages are combined to determine amplification
- Suitable for audio signals (A-131) or control voltage processing (A-130)
- Can produce tremolo when modulated by LFO in sub-audio range (1 Hz to 15 Hz)
- Supports keyboard tracking via CV input from keyboard controller
- Supports inverted keyboard tracking via Voltage-Inverter A-175
- Patch sheet included for documenting user patches
Controls & Jacks (16)
- VCA 1 CV 2 — CV attenuator for VCA 1 CV 2 input, controls the amount of effect the CV has on amplification
- VCA 1 Audio In 1 — Audio input attenuator for VCA 1 input 1
- VCA 1 Audio In 1 — First audio input for VCA 1
- VCA 1 Gain — Overall gain control for VCA 1, determining amplification amount from 0 (no amplification) to maximum
- VCA 1 CV 1 1 — Second control voltage input for VCA 1 with attenuation
- VCA 1 Audio Out — Audio output from VCA 1
- VCA 2 Gain — Overall gain control for VCA 2, determining amplification amount from 0 (no amplification) to maximum
- VCA 1 CV 1 2 — Control voltage input for VCA 1
- VCA 1 Audio In 2 — Second audio input for VCA 1
- VCA 2 CV 1 — Control voltage input for VCA 2
- VCA 1 Out — Output level control for VCA 1, attenuates the combined amplified signal
- VCA 2 CV 2 — CV attenuator for VCA 2 CV 2 input, controls the amount of effect the CV has on amplification for VCA 2
- VCA 2 Audio In 1 — Audio input attenuator for VCA 2 input 1
- VCA 2 Audio In 2 — Audio input attenuator for VCA 2 input 2
- VCA 2 Out — Output level attenuator for VCA 2
- VCA 2 Audio Out — Audio output from VCA 2
How-To Guides
- Classic ADSR Amplitude Shaping
- Tremolo via LFO Amplitude Modulation
- Keyboard Tracking — Louder with Higher Notes
- Inverted Keyboard Tracking — Louder with Lower Notes
- Noise Burst Percussion Shaping
- CV Signal Gating and Scaling
- Two-Source Audio Mixing Through Single VCA
- AM Synthesis with Audio-Rate LFO
- Voltage-Controlled Tremolo Depth
Explore the interactive A-130-2 Dual VCA panel on BleepDex — tap any control to learn what it does.
