# Doepfer A-108 6/12/24/48dB Low Pass Filter

drillable.com › eurorack › makers › doepfer-de › a-108.
As of the capture of 9 Sep 2026; the index built 17 Sep 2026, 22:24 UTC · [cites, never asserts](/standing).
Source: https://doepfer.de/a100_man/a108_man.pdf · quotes only, no licence recorded.
Search `/eurorack/makers/doepfer-de/a-108?q=…` · MCP https://mcp.drillable.com · [html](/eurorack/makers/doepfer-de/a-108?format=html) · [markdown](/eurorack/makers/doepfer-de/a-108?format=md) · [json](/eurorack/makers/doepfer-de/a-108?format=json) · [discovery](/.well-known/drillable.json) · [guide](/llms.txt)

## 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 108](/eurorack/makers/doepfer-de/a-108) (5 records)

- **controls** = manual controls for frequency and resonance · as [a 108 · a 108](/eurorack/makers/doepfer-de/a-108) · [quote](/hashes/sha256:e92d7fe632700ba4f6e45f6362d0287813228658331781db6ec65452c91ad196?trace&start=546&end=615) · [sha256:530827ef14a2546d…](/hashes/sha256:530827ef14a2546d2c30301ad228d4c59bda32efc614c474eba5397f89865593)
- **behavior** = Close to its maximum setting, the filter becomes so resonant that it goes into self-oscillation, and starts behaving like a sine wave · as [a 108 · a 108](/eurorack/makers/doepfer-de/a-108) · [quote](/hashes/sha256:e92d7fe632700ba4f6e45f6362d0287813228658331781db6ec65452c91ad196?trace&start=3323&end=3457) · [sha256:410e882ad200f6d4…](/hashes/sha256:410e882ad200f6d4e0132f4a699f51f0f5e1f7777e04f9f992d929044abef955)
- **note** = Self oscillation will break off at high distortion levels as the internal feedback signal is drown out by the distorted audio signal · as [a 108 · a 108](/eurorack/makers/doepfer-de/a-108) · [quote](/hashes/sha256:e92d7fe632700ba4f6e45f6362d0287813228658331781db6ec65452c91ad196?trace&start=3547&end=3680) · [sha256:cfeeda62d8c847a6…](/hashes/sha256:cfeeda62d8c847a6a854ab36acbc596e65eac418d596bbbb639c71050cd70624)
- **behavior** = If the 48dB low pass output of the A-108 is connected to the feedback input of the A-108 through a VCA even the resonance is voltage controlled · as [a 108 · a 108](/eurorack/makers/doepfer-de/a-108) · [quote](/hashes/sha256:e92d7fe632700ba4f6e45f6362d0287813228658331781db6ec65452c91ad196?trace&start=8508&end=8683) · [sha256:29ff50e019794841…](/hashes/sha256:29ff50e019794841390f675e5dfd79278c2d31a9bc1b09b43e50f683d305c823)
- **count** = 4 output stages · as [a 108 · a 108](/eurorack/makers/doepfer-de/a-108) · [quote](/hashes/sha256:e92d7fe632700ba4f6e45f6362d0287813228658331781db6ec65452c91ad196?trace&start=9205&end=9291) · [sha256:a39a1d53500b48bc…](/hashes/sha256:a39a1d53500b48bc1822066ea1bb06c887d4eeabefc0b4b8f5f580e7aee8028c)

### [a 108 example patch](/eurorack/makers/doepfer-de/a-108/a-108-example-patch) (2 records)

- **configuration** = filter with voltage controlled cut-off slope in combination with the voltage controlled mixer A-135 and the morphing controller A-144 · as [a 108 · a 108 example patch](/eurorack/makers/doepfer-de/a-108/a-108-example-patch) · [quote](/hashes/sha256:e92d7fe632700ba4f6e45f6362d0287813228658331781db6ec65452c91ad196?trace&start=7139&end=7294) · [sha256:9ac36466abc87371…](/hashes/sha256:9ac36466abc8737155562666de2e661e6751cc11d3591ebc805b21b68c1f781c)
- **range** = sweep the cut-off slope from 6 ... 48dB · as [a 108 · a 108 example patch](/eurorack/makers/doepfer-de/a-108/a-108-example-patch) · [quote](/hashes/sha256:e92d7fe632700ba4f6e45f6362d0287813228658331781db6ec65452c91ad196?trace&start=7863&end=8004) · [sha256:695c56f08daeef21…](/hashes/sha256:695c56f08daeef2168485e568417104c99e73a92ade1ef47e46cc8d0b1d03a77)

### [audio in](/eurorack/makers/doepfer-de/a-108/audio-in) (2 records)

- **note** = Distortion appears about from position 5 with normal A-100 audio levels · as [audio input](/eurorack/makers/doepfer-de/a-108/audio-input) · [quote](/hashes/sha256:e92d7fe632700ba4f6e45f6362d0287813228658331781db6ec65452c91ad196?trace&start=2981&end=3053) · [sha256:7570d4d5dcda57ae…](/hashes/sha256:7570d4d5dcda57ae9abc64ef9fdb03530051668b769aa554ab3ea6c18f293869)
- **purpose** = Patch in the output from any sound source (eg. VCO, noise generator, subharmonic oscillator, sampler, mixer output) · as [a 108 · audio in](/eurorack/makers/doepfer-de/a-108/audio-in) · [quote](/hashes/sha256:e92d7fe632700ba4f6e45f6362d0287813228658331781db6ec65452c91ad196?trace&start=4363&end=4479) · [sha256:31b8dab9fef295a3…](/hashes/sha256:31b8dab9fef295a3fe47c1c8f61993c5bdbb1634de7dfcf0b452b552a4c57f06)

### [cv1](/eurorack/makers/doepfer-de/a-108/cv1) (1 record)

- **voltage-range** = approx. 1V/Oct. · as [a 108 · cv1](/eurorack/makers/doepfer-de/a-108/cv1) · [quote](/hashes/sha256:e92d7fe632700ba4f6e45f6362d0287813228658331781db6ec65452c91ad196?trace&start=1584&end=1653) · [sha256:787a33d3f1688f55…](/hashes/sha256:787a33d3f1688f55fd40aa157441537d3a5e0ce7d72cce2a531890b1334c55d3)

### [feedb](/eurorack/makers/doepfer-de/a-108/feedb) (1 record)

- **function** = external feedback input for resonance (audio input) · as [a 108 · feedb](/eurorack/makers/doepfer-de/a-108/feedb) · [quote](/hashes/sha256:e92d7fe632700ba4f6e45f6362d0287813228658331781db6ec65452c91ad196?trace&start=1806&end=1868) · [sha256:d44547128708aa12…](/hashes/sha256:d44547128708aa127a58b3eb48c0ced4144c9a086b2c9b65ae19a982dd69de12)

## Captures (1)

- 9 Sep 2026, 00:04 UTC · https://doepfer.de/a100_man/a108_man.pdf · quotes only (no licence recorded) · 0 revisits · [older text](/hashes/sha256:4ffca2c668d0b762a2e19d2b60339491857730ec9ef4b6987ec618436f3fcb92) (pdfium/7881, 20 bytes), [text](/hashes/sha256:e92d7fe632700ba4f6e45f6362d0287813228658331781db6ec65452c91ad196) (pdfium/7881, 12481 bytes) · capture [sha256:c78beb8abada475e…](/hashes/sha256:c78beb8abada475e9b35ff19850a4dec37414c4522a19f186b3cddd9fbd7f7d2)

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.

---
[standing](/standing) · Drillable™ is a trademark of Drillable LLC.