doepfer/a-137-2
A-137-2
Wave Multiplier II: generates four phase-shifted copies of an audio input signal (sawtooth, triangle, or sine) and adds them to the original to produce a fat sound similar to five independent VCOs. Phase shifting is achieved by comparing the input with a slowly varying CV; the resulting rectangle is algebraically added to produce shifted waveforms.512
Capabilities 2
Jacks 5
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (5) | |||
| Audio In | audio | — | Audio input with attenuator. Works with sloped signals (sawtooth, triangle, sine) but not rectangles or pulses. Level sets the correct summation ratio between original and comparator signals.512 |
| CV Shift 1 | cv | — | 512 |
| CV Shift 2 | cv | — | 512 |
| CV Shift 3 | cv | — | 512 |
| CV Shift 4 | cv | — | 512 |
Parameters 14
| Name | Type | Range | Behavior |
|---|---|---|---|
| Audio In Level | knob | — | Attenuates the audio input signal to set the correct summation level between the original signal and the four comparator (shifted) signals.512 |
| CV Shift 1 Attenuator | knob | — | Attenuates the CV signal applied to CV Shift 1 input before it modulates shifting circuit 1.512 |
| CV Shift 2 Attenuator | knob | — | Attenuates the CV signal applied to CV Shift 2 input before it modulates shifting circuit 2.512 |
| CV Shift 3 Attenuator | knob | — | Attenuates the CV signal applied to CV Shift 3 input before it modulates shifting circuit 3.512 |
| CV Shift 4 Attenuator | knob | — | Attenuates the CV signal applied to CV Shift 4 input before it modulates shifting circuit 4.512 |
| Jumper 1 | jumper | — | Summing jumper for one of 5 signals (original + 4 shifted). See appendix for board positions.512 |
| Jumper 2 | jumper | — | Enables or disables shifted copy 2 in the summing mix. Can be replaced by an external toggle switch.512 |
| Jumper 3 | jumper | — | Enables or disables shifted copy 3 in the summing mix. Can be replaced by an external toggle switch.512 |
| Jumper 4 | jumper | — | Enables or disables shifted copy 4 in the summing mix. Can be replaced by an external toggle switch.512 |
| Jumper 5 | jumper | — | Enables or disables the original (unshifted) signal in the summing mix. Can be replaced by an external toggle switch.512 |
| Shift 1 | knob | — | Manual shift control for shifting circuit 1; sets the comparison level that determines the phase offset of the first copied signal.512 |
| Shift 2 | knob | — | Manual shift control for shifting circuit 2; sets the comparison level that determines the phase offset of the second copied signal.512 |
| Shift 3 | knob | — | Manual shift control for shifting circuit 3; sets the comparison level that determines the phase offset of the third copied signal.512 |
| Shift 4 | knob | — | Manual shift control for shifting circuit 4; sets the comparison level that determines the phase offset of the fourth copied signal.512 |
Firmware history 0 versions
No firmware history recorded.
References 2
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Doepfer A-137-2 Wave Multiplier II Appendixmanual● verified 2026-05-19
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