doepfer/a-138s
A-138s Mini Stereo Mixer
A simple but effective 4-in-2 stereo mixer with four inputs, each with a Level attenuator and Pan control, routing signals to Left and Right outputs. DC coupled for use with both audio and control signals.542
Capabilities 4
- Attenuverterattenuverter
- Per-channel Level faders attenuate (scale) each input from 0 to ~1.9× before pan routing. Curator-tagged to surface under attenuverter searches.542
- DC Coupleddc-coupled
- All inputs and outputs are DC coupled, enabling use with control voltages as well as audio signals.542
- Mixermixer
- 542
- Stereo Mixerstereo-mixer
- Four mono inputs each with Level attenuator and Pan control routed to a stereo Left/Right output pair.542
Jacks 6 — 4 in / 2 out
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (4) | |||
| IN 1 | mixed | — | Channel 1 mono input. DC coupled.542 |
| IN 2 | mixed | — | Channel 2 mono input. DC coupled.542 |
| IN 3 | mixed | — | Channel 3 mono input. DC coupled.542 |
| IN 4 | mixed | — | Channel 4 mono input. DC coupled.542 |
| Outputs (2) | |||
| OUT L | mixed | — | 542 |
| OUT R | mixed | — | 542 |
Parameters 8
| Name | Type | Range | Behavior |
|---|---|---|---|
| Level 1 | knob | — | Attenuates channel 1 input level before pan routing. Gain at fully CW with Pan center: ~1.6×.542 |
| Level 2 | knob | — | Attenuates channel 2 input level before pan routing.542 |
| Level 3 | knob | — | Attenuates channel 3 input level before pan routing.542 |
| Level 4 | knob | — | Attenuates channel 4 input level before pan routing.542 |
| Pan 1 | knob | — | Distributes channel 1 to OUT L and OUT R. CCW: left only; center: equal; CW: right only.542 |
| Pan 2 | knob | — | Distributes channel 2 to OUT L and OUT R.542 |
| Pan 3 | knob | — | Distributes channel 3 to OUT L and OUT R.542 |
| Pan 4 | knob | — | Distributes channel 4 to OUT L and OUT R.542 |
Firmware history 0 versions
No firmware history recorded.
References 1
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Doepfer A-138s Mini Stereo Mixer product pageproduct_page● verified 2026-05-19