Doepfer A-134-2 VC Crossfader
Voltage-controlled stereo panning and input crossfading
4 HP Eurorack module
The A-134 (PAN) is a voltage-controlled panning module that routes audio signals either between two inputs to one output (input mixing mode) or from one input to two outputs (output panning mode). It contains two matched linear VCAs and a mixer, enabling dynamic stereo placement controlled by CV sources such as LFOs, envelopes, sequencers, or random voltage generators. Its musical character is smooth, linear, and highly modulation-friendly, making it ideal for animated stereo fields and crossfading between sound sources.
Features
- Two matched linear VCAs for smooth, artifact-free panning
- Input mixing mode: crossfade between two audio inputs to a single Mix Output
- Output panning mode: position one audio signal across Left and Right outputs
- Manual Pan knob for static or manually swept panning
- CV 1 input for direct control voltage panning
- CV 2 input with dedicated attenuator knob for scaled control voltage
- Panning amount governed by sum of Pan knob and CV inputs
- Two LEDs provide visual indication of signal levels at outputs
- Lev 1 and Lev 2 attenuators for setting incoming audio signal levels independently
- Audio In 2 is a normalled (switched) socket that auto-connects to Audio In 1 when nothing is patched
- Mix Output provided in addition to Left and Right outputs
Controls & Jacks (14)
- In 1A — First audio input signal with level control
- CV 1 — Control voltage input for crossfading and panning
- In 2A — Second audio input signal with level control; switched socket automatically linked to input 1 if nothing connected
- Out 1 — Left audio output
- CV 2 — Control voltage input with attenuator for precise CV level control
- Out 2 — Mixed output of both input signals in input mixing mode
- In 1B
- In 2B
- Lev 1 — Level attenuator for audio signal at input 1
- Lev 2 — Level attenuator for audio signal at input 2
- Pan — Manual panning control for crossfading between inputs or controlling position in stereo soundstage
- Left — Status indicator showing signal level at left output or mixing from input 1
- Right — Status indicator showing signal level at right output or mixing from input 2
- Right Output — Right audio output
How-To Guides
- LFO Auto-Panner
- Envelope-Triggered Pan Sweep
- Random Stereo Position Per Note
- Sequencer-Driven Stereo Placement
- Theremin Hand-Controlled Panning
- Voltage-Controlled Crossfade Between Two Sources
- MIDI Pitch-Controlled Spatial Placement
- Dual CV Modulation with Offset
Explore the interactive A-134-2 VC Crossfader panel on BleepDex — tap any control to learn what it does.
