# Doepfer A-151 Quad Sequential Switch

drillable.com › eurorack › makers › doepfer-de › a-151.
As of the capture of 9 Sep 2026; the index built 17 Sep 2026, 21:11 UTC · [cites, never asserts](/standing).
Source: https://doepfer.de/a100_man/A151_man.pdf · quotes only, no licence recorded.
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## Records read from it (11)

By drillable.com ([llm-extract/3](/standing#methods)); scored precision 1.00, recall 0.36 on the harness's last sample of 50.

### [a 151 user example tone sequencing](/eurorack/makers/doepfer-de/a-151/a-151-user-example-tone-sequencing) (5 records)

- **description** = produces a four-step tonal sequence, with a different filter envelope for each of the four steps · as [a 151 · a 151 user example tone sequencing](/eurorack/makers/doepfer-de/a-151/a-151-user-example-tone-sequencing) · [quote](/hashes/sha256:bffe8b425eff28ba0febfbd51bd28f071fbcaab006cc57175f3cc1c7dda38a02?trace&start=5221&end=5350) · [sha256:4c22fd1920270dd9…](/hashes/sha256:4c22fd1920270dd9eb5be569f82e06a6322225deae88ea5e84535c8f38f23794)
- **function** = An LFO simultaneously triggers ADSRs 1 to 4 and the switch on the A-151, so that for each step the VCF is affected by a different one of the four envelopes · as [a 151 · a 151 user example tone sequencing](/eurorack/makers/doepfer-de/a-151/a-151-user-example-tone-sequencing) · [quote](/hashes/sha256:bffe8b425eff28ba0febfbd51bd28f071fbcaab006cc57175f3cc1c7dda38a02?trace&start=5352&end=5510) · [sha256:a207f3c1ed6e111c…](/hashes/sha256:a207f3c1ed6e111c8409c7f99e671a77b84ad56bf0d4a7b65141a8baf4e41c1b)
- **function** = ADSR 5 is also triggered by the LFO, and controls the VCA · as [a 151 · a 151 user example tone sequencing](/eurorack/makers/doepfer-de/a-151/a-151-user-example-tone-sequencing) · [quote](/hashes/sha256:bffe8b425eff28ba0febfbd51bd28f071fbcaab006cc57175f3cc1c7dda38a02?trace&start=5511&end=5570) · [sha256:1cdf3574a3d36bab…](/hashes/sha256:1cdf3574a3d36bab13b2eb4c7f350171f0524bf6de3cee8795f6467301ab1504)
- **requirements** = It’s crucial to make the envelopes of all the ADSRs fit the LFO’s speed · as [a 151 · a 151 user example tone sequencing](/eurorack/makers/doepfer-de/a-151/a-151-user-example-tone-sequencing) · [quote](/hashes/sha256:bffe8b425eff28ba0febfbd51bd28f071fbcaab006cc57175f3cc1c7dda38a02?trace&start=5573&end=5650) · [sha256:84bb1a2e6f8fea64…](/hashes/sha256:84bb1a2e6f8fea643af788bfc2bd5774c65ef0b0d66acd04c19ad3153be16a8c)
- **alternative** = If you use a keyboard gate as the trigger instead of the LFO, each note played steps through to the next envelope · as [a 151 · a 151 user example tone sequencing](/eurorack/makers/doepfer-de/a-151/a-151-user-example-tone-sequencing) · [quote](/hashes/sha256:bffe8b425eff28ba0febfbd51bd28f071fbcaab006cc57175f3cc1c7dda38a02?trace&start=5820&end=5936) · [sha256:638fbb969340ff9e…](/hashes/sha256:638fbb969340ff9e4468c4824347fd8eec8ee71763802a1dd2900638d2072ae1)

### [a 151](/eurorack/makers/doepfer-de/a-151) (4 records)

- **description** = like an electronic four-position rotary switch · as [a 151 · a 151](/eurorack/makers/doepfer-de/a-151) · [quote](/hashes/sha256:bffe8b425eff28ba0febfbd51bd28f071fbcaab006cc57175f3cc1c7dda38a02?trace&start=70&end=159) · [sha256:cc4c034d4d92c97d…](/hashes/sha256:cc4c034d4d92c97df23fc288825df3e3938b90b5d9d1840d9d583dfa265ebe06)
- **voltage-range** = -8V to +8V · as [a 151 · a 151](/eurorack/makers/doepfer-de/a-151) · [quote](/hashes/sha256:bffe8b425eff28ba0febfbd51bd28f071fbcaab006cc57175f3cc1c7dda38a02?trace&start=478&end=571) · [sha256:8c157f8834dfdddc…](/hashes/sha256:8c157f8834dfdddc914c2b621061fda17baf7b36b9df9679cef874da938646ca)
- **note** = Voltages less than -8V or more than +8V will lead to malfunction of the module · as [a 151 · a 151](/eurorack/makers/doepfer-de/a-151) · [quote](/hashes/sha256:bffe8b425eff28ba0febfbd51bd28f071fbcaab006cc57175f3cc1c7dda38a02?trace&start=3684&end=3765) · [sha256:98359de32ef47502…](/hashes/sha256:98359de32ef47502c72d9f2933d295b1db5722eab7fc7c6ae405a7651b915dfa)
- **website** = www.doepfer.com · as [a 151 · a 151](/eurorack/makers/doepfer-de/a-151) · [quote](/hashes/sha256:bffe8b425eff28ba0febfbd51bd28f071fbcaab006cc57175f3cc1c7dda38a02?trace&start=3862&end=4041) · [sha256:6068d3e02fa2d40a…](/hashes/sha256:6068d3e02fa2d40abd9fd5db363a5f9916b6eb8f0661e809f3cfb0b266f182ee)

### [res in](/eurorack/makers/doepfer-de/a-151/res-in) (1 record)

- **function** = Input for reset pulse · as [a 151 · res in](/eurorack/makers/doepfer-de/a-151/res-in) · [quote](/hashes/sha256:bffe8b425eff28ba0febfbd51bd28f071fbcaab006cc57175f3cc1c7dda38a02?trace&start=1524&end=1557) · [sha256:496d344591a46ecf…](/hashes/sha256:496d344591a46ecf0069ac86a5daa346372fc0aef7cdba0a31d7687c2bf1872c)

### [trig in](/eurorack/makers/doepfer-de/a-151/trig-in) (1 record)

- **function** = Input for trigger pulse · as [a 151 · trig in](/eurorack/makers/doepfer-de/a-151/trig-in) · [quote](/hashes/sha256:bffe8b425eff28ba0febfbd51bd28f071fbcaab006cc57175f3cc1c7dda38a02?trace&start=1487&end=1523) · [sha256:bbec3bce9fe81940…](/hashes/sha256:bbec3bce9fe8194051c78bcff394acb3288a4d1fee11c0ee663d26174e4df7cf)

## Captures (1)

- 9 Sep 2026, 00:05 UTC · https://doepfer.de/a100_man/A151_man.pdf · quotes only (no licence recorded) · 0 revisits · [text](/hashes/sha256:bffe8b425eff28ba0febfbd51bd28f071fbcaab006cc57175f3cc1c7dda38a02) (pdfium/7881, 6411 bytes), [older text](/hashes/sha256:fbfa5ad7d9aa0afe439ec4ff3883acc4cb92b62cb67c40d674320c9aa1d4642d) (pdfium/7881, 12 bytes) · capture [sha256:f43ff9fd169b5909…](/hashes/sha256:f43ff9fd169b59090ceab8b9582ca891d9decd6692e9b0293e04852422fef060)

A capture is what the source served at that moment; a later change at the source is a new capture, never an edit to this one.

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