doepfer/a-129-2
A-129/2
Synthesis section of the A-129 modular vocoder. Takes a carrier signal through a bank of 15 bandpass/lowpass/highpass filters, each with a VCA controlled by CV inputs from the A-129/1 analysis section, producing the classic vocoder effect. Can also be used as a standalone voltage-controlled filter bank.369
Capabilities 3
- Fixed Filter Bankfixed-filter-bank
- 15 filters: 1 lowpass (100 Hz), 13 bandpass (120 Hz–7.5 kHz), 1 highpass (10 kHz). Can be used standalone as a voltage-controlled filter bank.369
- VCA Bankvca-bank
- Each of the 15 filter bands has a dedicated VCA whose gain is controlled by the corresponding CV input, allowing per-band amplitude modulation from the analysis section.369
- Vocodervocoder
- Synthesis section of the A-129 modular vocoder. Carrier signal is split into 15 filter bands (13 bandpass + lowpass + highpass); each band's VCA is driven by a corresponding CV input from the A-129/1 analysis section.369
Jacks 17 — 16 in / 1 out
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (16) | |||
| Band 1 (100 Hz LP) CV In | cv | — | CV input controlling the VCA on band 1 (100 Hz lowpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 1 envelope-follower output.369 |
| Band 10 (1.6 kHz) CV In | cv | — | CV input controlling the VCA on band 10 (1.6 kHz bandpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 10 envelope-follower output.369 |
| Band 11 (2.3 kHz) CV In | cv | — | CV input controlling the VCA on band 11 (2.3 kHz bandpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 11 envelope-follower output.369 |
| Band 12 (3.3 kHz) CV In | cv | — | CV input controlling the VCA on band 12 (3.3 kHz bandpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 12 envelope-follower output.369 |
| Band 13 (5 kHz) CV In | cv | — | CV input controlling the VCA on band 13 (5 kHz bandpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 13 envelope-follower output.369 |
| Band 14 (7.5 kHz) CV In | cv | — | CV input controlling the VCA on band 14 (7.5 kHz bandpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 14 envelope-follower output.369 |
| Band 15 (10 kHz HP) CV In | cv | — | CV input controlling the VCA on band 15 (10 kHz highpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 15 envelope-follower output.369 |
| Band 2 (120 Hz) CV In | cv | — | CV input controlling the VCA on band 2 (120 Hz bandpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 2 envelope-follower output.369 |
| Band 3 (160 Hz) CV In | cv | — | CV input controlling the VCA on band 3 (160 Hz bandpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 3 envelope-follower output.369 |
| Band 4 (230 Hz) CV In | cv | — | CV input controlling the VCA on band 4 (230 Hz bandpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 4 envelope-follower output.369 |
| Band 5 (330 Hz) CV In | cv | — | CV input controlling the VCA on band 5 (330 Hz bandpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 5 envelope-follower output.369 |
| Band 6 (500 Hz) CV In | cv | — | CV input controlling the VCA on band 6 (500 Hz bandpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 6 envelope-follower output.369 |
| Band 7 (750 Hz) CV In | cv | — | CV input controlling the VCA on band 7 (750 Hz bandpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 7 envelope-follower output.369 |
| Band 8 (1.1 kHz) CV In | cv | — | CV input controlling the VCA on band 8 (1.1 kHz bandpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 8 envelope-follower output.369 |
| Band 9 (1.3 kHz) CV In | cv | — | CV input controlling the VCA on band 9 (1.3 kHz bandpass) of the synthesis filter bank. In the standard vocoder patch, fed from the A-129/1 Band 9 envelope-follower output.369 |
| Instrument In | audio | — | Input for the carrier signal (instrument). Accepts harmonically-rich audio such as sawtooth waves, noise, or multiple VCOs.369 |
| Outputs (1) | |||
| Vocoder Out | audio | — | Audio output for the entire vocoder synthesis section, mixing all filter band VCA outputs.369 |
Parameters 0
No parameters recorded.
Firmware history 0 versions
No firmware history recorded.
References 2
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[369]
Doepfer A-129/1 + A-129/2 Vocoder Analyzer/Synthesizer Manualmanual● verified 2026-05-15
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[370]
Doepfer A-129 Vocoder Subsystem product pageproduct_page● verified 2026-05-15