# Doepfer A-127 drillable.com › eurorack › makers › doepfer-de › a-127. As of the capture of 9 Sep 2026; the index built 18 Sep 2026, 23:02 UTC · [cites, never asserts](/standing). Source: https://doepfer.de/a100_man/A127_man.pdf · quotes only, no licence recorded. Search `/eurorack/makers/doepfer-de/a-127?q=…` · MCP https://mcp.drillable.com · [html](/eurorack/makers/doepfer-de/a-127?format=html) · [markdown](/eurorack/makers/doepfer-de/a-127?format=md) · [json](/eurorack/makers/doepfer-de/a-127?format=json) · [discovery](/.well-known/drillable.json) · [guide](/llms.txt) No in-force window is declared for the document. ## Records read from it (35) By drillable.com ([llm-extract/3](/standing#methods)); scored precision 1.00, recall 0.36 on the harness's last sample of 50. ### [a 127](/eurorack/makers/doepfer-de/a-127) (7 records) - **type** = Voltage-Controlled Triple Resonance Filter · as [a 127 · a 127](/eurorack/makers/doepfer-de/a-127) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=74&end=206) · [sha256:6f7f8c78c54331ef…](/hashes/sha256:6f7f8c78c54331efd3e5b2ad6ee931e5eee767fae9e496e5dd66bd962d8a8f9f) - **features** = Each filter has its own audio output · as [a 127 · a 127](/eurorack/makers/doepfer-de/a-127) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=359&end=396) · [sha256:d2e9351e580c8d9b…](/hashes/sha256:d2e9351e580c8d9b10961a2f263cd747903e0551508565a0f3d38942d37da361) - **configuration** = each of the three filters can also be configured as a 12dB low-pass filter with resonance control · as [a 127 · a 127](/eurorack/makers/doepfer-de/a-127) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=841&end=976) · [sha256:92243cb2d538e6f0…](/hashes/sha256:92243cb2d538e6f0c4e9a7aa96883a0441ae958879aca69734ffb1c3af1fae0d) - **behavior** = a jumper has to be repositioned on each of the three circuit boards · as [a 127 · a 127](/eurorack/makers/doepfer-de/a-127) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=977&end=1083) · [sha256:976f229171665b27…](/hashes/sha256:976f229171665b2756127804cf0cd89046288f2e26abe33b923d10d6b39b5221) - **note** = The module is set up at the factory so that attenuator 1 doesn't have any effect on the Original signal level 8 · as [a 127 · a 127](/eurorack/makers/doepfer-de/a-127) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=4233&end=4472) · [sha256:f61c7c22a26a6b27…](/hashes/sha256:f61c7c22a26a6b27409826fe7952be805e645e4f24f5c0260814fe06ce242e01) - **note** = Using the filter at high resonance to produce its own pitched tone (self-oscillation) isn't possible with this module · as [a 127 · a 127](/eurorack/makers/doepfer-de/a-127) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=5968&end=6088) · [sha256:2fe503e61f81963d…](/hashes/sha256:2fe503e61f81963d3970a000e430fd86ce6b5b1fe970faaf751fc4a91ccea4cf) - **function** = By controlling filter frequencies with the internal LFO or external voltages, the A-127 can produce extremely complex filtering effects · as [a 127 · a 127](/eurorack/makers/doepfer-de/a-127) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=8104&end=8240) · [sha256:0144c98ff8e63bf1…](/hashes/sha256:0144c98ff8e63bf1e98d83bc52075fd4f364bc7f0dd206a8c60233d19d936e22) ### [control 1](/eurorack/makers/doepfer-de/a-127/control-1) (4 records) - **function** = Input signal attenuator · as [a 127 · control 1](/eurorack/makers/doepfer-de/a-127/control-1) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=1755&end=1794) · [sha256:f19ea68718e17f4f…](/hashes/sha256:f19ea68718e17f4f4152a216ef0521f68dcaf910d4d81d20124998516eef9d98) - **behavior** = The filter inputs are very sensitive, so it's possible to overdrive the Filter with a normal A-100 signal level (e.g. a VCO) · as [a 127 · control 1](/eurorack/makers/doepfer-de/a-127/control-1) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=3997&end=4124) · [sha256:9f2e887404ad7eb1…](/hashes/sha256:9f2e887404ad7eb1cb9c336fa45a74e80fe1af06811e9caf19b8b26a0c7d68f4) - **behavior** = As standard from the factory, Attenuator 1 doesn't have any effect on the Original control 8, so that it's possible to adjust 1 and 8 independently · as [a 127 · control 1](/eurorack/makers/doepfer-de/a-127/control-1) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=13470&end=13622) · [sha256:670f8f0442fcebb2…](/hashes/sha256:670f8f0442fcebb2544f647a8bc789d7a14a850a8084a2fe0e86372be2bd5521) - **note** = Even a toggle switch can be added to switch between pre and post setting of control 1 · as [a 127 · control 1](/eurorack/makers/doepfer-de/a-127/control-1) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=14077&end=14166) · [sha256:826cdd7b029836a6…](/hashes/sha256:826cdd7b029836a69c33ccb480098e2c60c97ec35ab9c2a1839f35924ef6bbcc) ### [filter jumper](/eurorack/makers/doepfer-de/a-127/filter-jumper) (4 records) - **note** = The standard factory setting is for each of the filters to be set to the bandpass position (labelled "BP") · as [a 127 · filter jumper](/eurorack/makers/doepfer-de/a-127/filter-jumper) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=12749&end=12856) · [sha256:ca6b4ea41dccea92…](/hashes/sha256:ca6b4ea41dccea92ee201cc7ca52c1ece4f41452d80369d5d16a1e2570596c64) - **behavior** = You can, if you want, alter the response of each individual filter, so that it is 12 db low-pass · as [a 127 · filter jumper](/eurorack/makers/doepfer-de/a-127/filter-jumper) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=12857&end=12954) · [sha256:8d816ba3fbf2488e…](/hashes/sha256:8d816ba3fbf2488e5aa5e8101a7d677961e4432e8a1a85f7e0d91cc8cd882ce1) - **behavior** = Change Jumper J1 on the filter circuit board from position "BP" to position "LP" (low pass) · as [jumper j1](/eurorack/makers/doepfer-de/a-127/a-127-v1-v2/jumper-j1) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=12955&end=13098) · [sha256:f882d3bc0b280051…](/hashes/sha256:f882d3bc0b2800514083b684f92abb874888b6f3412294d2cc8f7550f4f7f13c) - **note** = Even a toggle switch can be added to switch between low pass and band pass for each filter · as [a 127 · filter jumper](/eurorack/makers/doepfer-de/a-127/filter-jumper) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=13235&end=13326) · [sha256:3ca4caeb46074b13…](/hashes/sha256:3ca4caeb46074b13ed46bca3d31bcf40c7757c005a1c11ade0539734b95bdad5) ### [control 6](/eurorack/makers/doepfer-de/a-127/control-6) (3 records) - **function** = Filter resonance control · as [a 127 · control 6](/eurorack/makers/doepfer-de/a-127/control-6) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=1980&end=2018) · [sha256:bc28e4181ae4bc46…](/hashes/sha256:bc28e4181ae4bc4615bfc4783e4a1c738cc9b56f99b2866ae6015fcbe83dfcf1) - **function** = Control 6 is used to set the filter resonance. The higher this control is set, the narrower the bandwidth of the bandpass effect · as [a 127 · control 6](/eurorack/makers/doepfer-de/a-127/control-6) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=5583&end=5725) · [sha256:a70b906bb317322d…](/hashes/sha256:a70b906bb317322de4228650bbdab9cb7ed8c702f46862e22d6aea2a7fc5183f) - **behavior** = If the module has been re-configured to be a low pass filter, control 6 boosts the frequencies around the filter cut-off point · as [a 127 · control 6](/eurorack/makers/doepfer-de/a-127/control-6) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=5785&end=5967) · [sha256:41437edf17833030…](/hashes/sha256:41437edf17833030ca1f2ff0d999fcae3dccbc5369f47f5d0ac7cd4bba2cf389) ### [ext cv](/eurorack/makers/doepfer-de/a-127/ext-cv) (3 records) - **io** = Filter frequency CV input · as [a 127 · ext cv](/eurorack/makers/doepfer-de/a-127/ext-cv) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=2476&end=2513) · [sha256:fc42ef085f4fc3b1…](/hashes/sha256:fc42ef085f4fc3b1e4e922afcb02bd48c871a7bd6256a3bc65aa173d8b0b92f2) - **behavior** = If the socket has nothing connected, the amplitude of the internal LFO is controlled; if the socket does have something connected, the amplitude of the external control voltage is controlled · as [a 127 · ext cv](/eurorack/makers/doepfer-de/a-127/ext-cv) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=5053&end=5244) · [sha256:be55af4af2426f4a…](/hashes/sha256:be55af4af2426f4abe5ee66dcb97f6aedf5970f9768b2b426a011bebd892bf81) - **normalling** = This is a normalled (switched) socket. If no connection is made, the internal LFO serves as the modulation source instead · as [a 127 · ext cv](/eurorack/makers/doepfer-de/a-127/ext-cv) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=7358&end=7480) · [sha256:50f39370229ff302…](/hashes/sha256:50f39370229ff30259710293c264b7a613336e68445ef6d89a1dd335c06118df) ### [audio in](/eurorack/makers/doepfer-de/a-127/audio-in) (2 records) - **io** = Input to the filter · as [a 127 · audio in](/eurorack/makers/doepfer-de/a-127/audio-in) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=2434&end=2466) · [sha256:ca1dbbaa01edc1d3…](/hashes/sha256:ca1dbbaa01edc1d3535a094be1d4b5b2ac50b75b94e8f6ce2cf57faf1f37c11f) - **io** = This is the socket into which you connect the audio signal which you want to be filtered · as [a 127 · audio in](/eurorack/makers/doepfer-de/a-127/audio-in) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=7104&end=7193) · [sha256:0d734d6d7153b48a…](/hashes/sha256:0d734d6d7153b48aae38d127b53d1a250c05620c142bd2ddb8745f7073f3829c) ### [audio out](/eurorack/makers/doepfer-de/a-127/audio-out) (2 records) - **io** = Filter output · as [a 127 · audio out](/eurorack/makers/doepfer-de/a-127/audio-out) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=2514&end=2542) · [sha256:479e49c5a578c109…](/hashes/sha256:479e49c5a578c109fbe18c6322092371fb2296f1abc5df2f6a8b27891e6f2092) - **function** = Each filter Audio output sends out the signal processed by the particular filter · as [a 127 · audio out](/eurorack/makers/doepfer-de/a-127/audio-out) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=7553&end=7637) · [sha256:d53490db7598b774…](/hashes/sha256:d53490db7598b7743906aa07d8e9b9f5c74351a465b5aa5c19a322c479b7f2d8) ### [control 7](/eurorack/makers/doepfer-de/a-127/control-7) (2 records) - **function** = Level control for audio output amplitude of the filter · as [a 127 · control 7](/eurorack/makers/doepfer-de/a-127/control-7) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=2019&end=2093) · [sha256:a8075cd0bd4a4d12…](/hashes/sha256:a8075cd0bd4a4d1262938c080cdc821053fdd569d764328f9ffc91e27adb31f8) - **function** = Attenuator 7 adjusts the amount of the signal from each of the filters to be fed into the Mix signal at output · as [a 127 · control 7](/eurorack/makers/doepfer-de/a-127/control-7) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=6103&end=6216) · [sha256:f5167b1f151cb49b…](/hashes/sha256:f5167b1f151cb49b7c4e757cf2223254c2fba25a96f79d7d3a8d76dff9ccdce3) ### [vcf frq](/eurorack/makers/doepfer-de/a-127/vcf-frq) (2 records) - **function** = Filter frequency control · as [control 5](/eurorack/makers/doepfer-de/a-127/control-5) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=1942&end=1979) · [sha256:de735e6db2740723…](/hashes/sha256:de735e6db27407239af32a399c5d5e08c5e9620697e223b053b6175dbbfa06dd) - **behavior** = The actual filter frequency is determined by the sum of the voltages from the control knob and the modulation signal (LFO or external control voltage) · as [a 127 · vcf frq](/eurorack/makers/doepfer-de/a-127/vcf-frq) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=5419&end=5570) · [sha256:c6f5a8ea32c90a59…](/hashes/sha256:c6f5a8ea32c90a59b17466d7032e20591b8ad7599f00d952424fda99034df84d) ### [band pass filter](/eurorack/makers/doepfer-de/a-127/band-pass-filter) (1 record) - **definition** = attenuate signals in frequency ranges both above and below the filter frequency - referred to here as the middle frequency - resulting in a bell-shaped response curve · as [a 127 · band pass filter](/eurorack/makers/doepfer-de/a-127/band-pass-filter) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=2785&end=3000) · [sha256:a4db5dcf90aa5737…](/hashes/sha256:a4db5dcf90aa57375d404ecfce7bc2a934e0c91bb60849a98efdb42fddd20e19) ### [control 2](/eurorack/makers/doepfer-de/a-127/control-2) (1 record) - **function** = LFO frequency control · as [a 127 · control 2](/eurorack/makers/doepfer-de/a-127/control-2) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=1805&end=1839) · [sha256:9c5bb8b6f7c0964d…](/hashes/sha256:9c5bb8b6f7c0964dfb760f2a38dae168957772a1bb5fd226d11066b04de18914) ### [control 3](/eurorack/makers/doepfer-de/a-127/control-3) (1 record) - **function** = Attenuator for external CV and/or LFO amplitude · as [a 127 · control 3](/eurorack/makers/doepfer-de/a-127/control-3) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=1840&end=1900) · [sha256:6766e789fa7d193d…](/hashes/sha256:6766e789fa7d193da00517c26288bfffd9d9c35a50b46db4e5bb18ec23bca9a1) ### [control 4](/eurorack/makers/doepfer-de/a-127/control-4) (1 record) - **function** = LFO and/or external CV indicator · as [a 127 · control 4](/eurorack/makers/doepfer-de/a-127/control-4) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=1901&end=1941) · [sha256:7e353988b7048c8a…](/hashes/sha256:7e353988b7048c8a84089985c13e380bc8679a4d09e9e7fb7105d1acb11fb7f2) ### [control 8](/eurorack/makers/doepfer-de/a-127/control-8) (1 record) - **function** = Control for setting the amount of the original signal present at the Mix output · as [a 127 · control 8](/eurorack/makers/doepfer-de/a-127/control-8) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=2094&end=2188) · [sha256:8bdb517753f3c546…](/hashes/sha256:8bdb517753f3c5466fe51feba09990fb63ee899bfd087857cba6e08de9276f2c) ### [mix out](/eurorack/makers/doepfer-de/a-127/mix-out) (1 record) - **io** = Mix output · as [a 127 · mix out](/eurorack/makers/doepfer-de/a-127/mix-out) · [quote](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622?trace&start=2543&end=2565) · [sha256:96af3d4531fa4a3d…](/hashes/sha256:96af3d4531fa4a3de145138359b702604ccb560ee6d35f0f709240ab1bd1e38d) ## Captures (1) - 9 Sep 2026, 00:05 UTC · https://doepfer.de/a100_man/A127_man.pdf · quotes only (no licence recorded) · 0 revisits · [older text](/hashes/sha256:49cb2d2ab1323ea968a401fbd24a20d2b51aa1879c735f4b16f487797c9fa81f) (pdfium/7881, 24 bytes), [text](/hashes/sha256:65d2344569ba5ad32a31c6201a810429463534a47ccc33ffee451a5459fbb622) (pdfium/7881, 14219 bytes) · capture [sha256:88995032269db7e8…](/hashes/sha256:88995032269db7e80c35684ca7e61f124c7de5da009556896960e9102275e4aa) 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.