Filter Techniques for Deep Techno — The Complete Chapter

The 64-bar slow low-pass chord opening

The single most important filter move in the genre: a chord stab that starts as a muffled thump at 180–250 Hz and opens over 32–64 bars to 2–4 kHz, then closes again. Nothing else in the track needs to change.

1. Leave the synth’s own filter open (or lightly closed at 6 kHz) so the Auto Filter does all the work; otherwise two filters fight and the sweep feels non-linear.
2. Auto Filter: LP 24, circuit PRD or SMP, Res 20–30%, Drive 3–6 dB to keep closed states audible.
3. In Arrangement, draw cutoff automation from 200 Hz at bar 1 to ~2.5 kHz at bar 64. Use a curved segment (Alt/Option-drag the line) bending so the first 40 bars move slowly and the last 24 move faster; perceived brightness is logarithmic, a straight line in Hz sounds like nothing happens then everything happens.
4. Put Echo and reverb after the filter so the tails darken and brighten with the source. Putting them before means the tails stay bright when the chord is closed, which destroys the “submerged” effect.
5. Ride Res inversely: 30% when closed (peak keeps it audible), drop to 15% as it opens (avoids harsh peaks crossing 2–3 kHz).

Resonant band-pass dub chord (Basic Channel-style)

The archetypal dub techno chord in the style of the classic Berlin dub techno sound: a minor 7th or 9th stab through a resonant BP, drenched in delay. The BP removes the body so the chord can be loud in the delay without clouding the low-mids, and the resonance gives it that nasal, ringing “dong”.

1. Analog: Osc1 and Osc2 saw, Osc2 detuned +7 ct, Fil1 BP 12 dB, Freq ~800 Hz, Reso 0.5–0.6, Fil1 envelope A 0, D 180 ms, S 0, amount ~+30% so each stab starts brighter and closes into the band.
2. Amp envelope: A 1 ms, D 250 ms, S 0, R 200 ms. The stab is short; the room comes from the send.
3. Auto Filter after it, BP with MS2 circuit, 700–1100 Hz, Res 40–55%. Two band-passes in series tighten the band and make the resonance more “wooden”.
4. Send 30–60% to an Echo return (see the delay-feedback technique below). Keep the dry stab quieter than the wet.
5. Automate the Auto Filter frequency between 500 Hz and 1.6 kHz over 16–32 bars; the delay tails smear the movement into a wash.

Filter inside the delay feedback loop

A filter in the feedback path is applied once per repeat, so repeats get progressively darker (LP), thinner (HP) or more nasal (BP). Moving that filter while the delay runs is the essence of dub: the tail morphs while the source is silent.

1. Simple: Echo on a return, Feedback 55–75%, HP 200–400 Hz and LP 2–3 kHz. Map the LP frequency to a knob; turning it during a tail is the move.
2. Advanced loop: on Return A, Delay at 100% wet with its own feedback at 0%, then Auto Filter, Saturator, Utility. Feed the return back into itself: return-to-return sends are disabled by default in Live, so enable Return A’s send to A via the send knob’s context menu (or loop A → B → A). Keep the self-send at −15 to −8 dB and creep up.
3. Always end the loop with a limiter or Saturator so runaway feedback clips musically instead of exploding.
4. Resonance in the loop rings louder each pass: keep Res below 50% or the loop self-oscillates at the filter frequency (sometimes exactly what you want for a dub siren).

High-pass rumble sculpting (the floor of the track)

The “rumble” of modern deep techno is a reverb or distorted-kick wash low-passed at 150–300 Hz and high-passed at 30–60 Hz, ducked by the kick. The filters define it: the HP stops it fighting the sub, the LP keeps it a pressure rather than a sound.

Kick-triggered envelope-follower filter

Instead of ducking a pad’s volume with the kick, duck (or open) its filter. The pad keeps its level but gets darker on every kick and blooms back between: pumping without the obvious compressor breath.

1. Auto Filter on the pad, LP 24, cutoff where the pad sounds fully open (2–4 kHz).
2. Enable the envelope follower’s external sidechain; choose the kick track (or a muted ghost-kick track if the kick has a long tail).
3. Envelope amount negative (−40 to −70%) so the kick pulls cutoff down. Attack 1–5 ms, Release 150–300 ms at 125 BPM (an 8th note is 240 ms).
4. For the inverse “bloom” effect, set amount positive with a low base cutoff (400 Hz): each kick brightens the pad briefly, like a resonant body struck by the beat.

LFO-synced filter at odd divisions (3/16, 5/16 polymeter)

Sync the filter LFO to 3/16 or 5/16 instead of 1/4 or 1 bar. The cutoff peak drifts against the kick, realigning only every 3 or 5 bars: a hypnotic, never-quite-repeating motion from a static loop.

1. Auto Filter LFO: Sync on, rate 3/16 (dotted 8th), shape sine or triangle, amount 25–45%. Base cutoff in the middle of the desired range.
2. Second Auto Filter (HP) at 5/16. The two cycles realign after 15 sixteenths; with the 4/4 grid the full pattern recurs every 15 bars.
3. Reset: if the LFO phase should restart on the clip, use the LFO’s retrigger/phase options or an M4L LFO with a reset; otherwise let it free-run so it is different every playthrough.
4. For a different flavour use 1/12 or 1/6 (triplets) on hats: a swung shimmer under a straight groove.

Sample & hold random filter

Random stepped cutoff per 16th or per note: each hit gets a different brightness. On a dub chord or a hat loop this reads as a “human” or machine-unstable performance rather than a sweep.

1. Auto Filter LFO shape: S&H (random steps). Sync 1/16 for hats, 1/8 or the note length for chords.
2. Keep amount moderate (20–35%); deep techno randomness should be “a bit different each time”, not a sci-fi computer.
3. Note-locked alternative: Sampler/Simpler, modulation matrix with Random → Filter Freq. Random per note instead of per clock step, so a ghost note and an accent each get a fresh cutoff.
4. Smoother: the Max for Live LFO device in S&H with its Smooth control at 20–40% gives “drunken” glides between random values.

Key-tracked self-oscillating filter as a tonal ping

Push resonance to self-oscillation, keytrack 100%, and trigger the filter with very short noise or click bursts. The filter rings a sine-like ping at the played pitch: a woody, analogue “bloop” or a tuned percussion element that is literally a filter.

1. Analog: oscillators off, Noise on at low level (or an oscillator with a very short amp envelope as the exciter).
2. Fil1 LP 24, Reso at max (self-oscillating), Freq set so that the played note sounds in tune (play C3 against a tuner, adjust Freq), Kbd tracking 100%.
3. Amp envelope A 0, D 120–300 ms, S 0: the ring decay is the note length.
4. Alternative in Auto Filter: an audio click track through Auto Filter LP 24 PRD with Res ~95%; tune cutoff manually and automate it for pitch changes.

Filter FM via fast or audio-rate modulation

Modulating cutoff very fast creates sidebands: from 10–40 Hz it becomes a gritty flutter or rolling texture; at true audio rate it adds metallic, FM-like harmonics. Used sparingly on a drone or rumble it gives “engine” motion.

1. Sub-audio flavour inside Live: Auto Filter or Wavetable LFO in Hz mode at its fast end (around 20–40 Hz). Amount 15–35%. This is not true FM but already produces the rolling grit.
2. Wavetable: modulate Filter 1 Freq from LFO 1 at max rate; add Note → LFO rate in the matrix so the flutter tracks pitch.
3. True audio-rate: route a VCO from the eurorack into the FM input of a hardware VCF, with the source sent out via External Audio Effect; tune the modulating VCO to the track key (or a 5th) for harmonic sidebands. CV Tools can provide the pitch for the modulator.
4. Keep the result low in the mix or band-limited (HP 150, LP 5 kHz); filter FM generates a lot of upper partials.

Comb filtering with Corpus or a short delay

Comb filters turn noise, hats and chords into tuned, metallic, pipe-like timbres. In deep techno they make the hat loop “sing” the root note or give a chord a hollow, tunnel quality.

1. Corpus: type Tube or Pipe, Dry/Wet 15–35%. Use MIDI Frequency (sidechain from a MIDI track) to tune the resonance to the bass note so the comb moves with the harmony.
2. Short delay method: Delay, sync off, time = 1000 / target Hz in ms (D2 at 146.8 Hz → 6.8 ms), feedback 60–85%. Automate the time for a flanged sweep; positive vs negative feedback (where available) gives peaks vs notches.
3. Resonators: tune I–V to a chord (root, 5th, octave, 10th) and set Decay short; place on a noise or hat return for an in-key shimmer.

Variations: Spectral Resonator on a noise or vinyl-crackle return, mode MIDI with the chord track as sidechain, Harmonics 4–12, Decay 0.5–3 s, then Auto Filter LP at 2–4 kHz: an in-key shimmer that follows the chords. Hats work too; the hat loop starts “singing” the harmony.

Formant filter vowels on pads and chords

Slowly morphing vowels give a pad a ghostly, choral quality without a vocal sample. Very effective on long chord swells in breakdowns.

1. Analog: Fil1 type Formant. The Freq control moves through the vowel set; automate it slowly (8–16 bars per vowel transition).
2. In 12.2 Auto Filter’s vowel/formant type, map vowel position to a macro with an LFO at 4 or 8 bars.
3. Meld: Formant engine as oscillator plus a vowel-type filter gives double formants; keep one static, move the other.
4. LP after the formant stage removes the hissy upper formants that sound cheap.

Notch sweep phasing

A slowly swept notch carves a moving hole through a dense chord or noise bed: subtle, liquid motion that does not change brightness much. Two notches an octave apart moving together = a minimal phaser.

1. Auto Filter type Notch; resonance controls width (higher = narrower in many models; listen).
2. LFO synced to 2–8 bars, triangle. Range roughly 300 Hz–3 kHz.
3. For a richer phase: Phaser-Flanger in Phaser mode with 4–8 notches, very low feedback, LFO at 8 bars, Dry/Wet 30–50%.

DJ-style EQ Three kills and HP/LP mixer filters for live

In a live set, the most used “filter” is the DJ-mixer one-knob: centre = flat, left = LP closing, right = HP opening. Plus EQ Three kills on groups for instant arrangement.

1. EQ Three on each group (drums, bass, chords, FX). 48 dB slope for clean kills; map Low/Mid/High Kill to pads on Push.
2. One-knob filter: if your Auto Filter version has the DJ-style type, use it. Otherwise build it: Audio Effect Rack with two Auto Filters (LP and HP), one macro mapped to LP cutoff 20 kHz → 150 Hz on the first half of the macro range and HP 20 Hz → 4 kHz on the second half (see the nonlinear macro technique).
3. Keep resonance low (10–20%) for DJ-style moves; a resonant one-knob gets harsh at the extremes on a loud system.
4. Classic deep techno transition: HP the outgoing group to 300 Hz over 8 bars while low-killing the incoming one, then swap kills on the downbeat.

Parallel filters in a rack (LP + BP chains, crossfade macro)

Two filters in parallel on the same source, crossfaded by a macro: one warm LP body chain, one resonant BP “dub” chain. Turning one knob changes the sound’s character, not just brightness.

1. Create an Audio Effect Rack, three chains. Open the Chain list and the Zone editor; set Chain Select zones with fade ranges overlapping (LP 0–80 fading out from 47, BP 47–127 fading in to 80).
2. Map Chain Selector to Macro 1. Map both cutoffs to Macro 2 with different ranges.
3. The Dry HP chain keeps a bit of untouched top end for clarity regardless of filter state.

Serial filter stacking

Filters in series multiply. Stacking a 12 dB LP on a 24 dB LP gives a 36 dB slope with two resonant peaks you can place independently; HP into LP makes a moving band-pass whose width you control.

1. HP → LP = variable-width BP. Map both to one macro moving in the same direction for a sliding window; opposite directions to widen/narrow.
2. Place the resonant peaks a fifth apart (e.g. 400 and 600 Hz) for a chordal resonance.
3. Put drive in the first filter, not the last: the second filter cleans the distortion’s harmonics.

Roar: filter before vs after saturation

Filter-then-distort: the filter decides what gets distorted; sweeping cutoff changes the distortion’s character, resonance gets amplified into a scream. Distort-then-filter: the distortion is constant, the filter tames it; sweeps sound like a closing door on a loud room. Deep techno usually wants the second for chords and the first for rumbles and bass textures.

1. Roar routing Serial. Stage 1: shaper Soft Sine, filter set pre-shaper, BP around 800–1200 Hz. The resonance pushes into the shaper: a grainy, vocal peak.
2. Stage 2: gentler shaper, filter post, LP 2–3 kHz to remove fizz.
3. Modulate Stage 1 filter with Roar’s LFO (sync 3/16) and Stage 2 with the Envelope Follower: input-dynamics-driven darkening.
4. Feedback routing with a filter in the loop: a resonant, pitched howl; set feedback pitch to the root.

Filter on the reverb return (sidechained)

Filter the reverb, not the dry signal. A reverb return HP’d at 300–600 Hz and LP’d at 4–6 kHz gives space without mud or sizzle; sidechaining the filter (not just the volume) to the kick makes the room breathe around the beat.

1. Hybrid Reverb’s EQ section: low cut 200–300 Hz pre or post reverb (pre gives a cleaner tail, post more natural decay).
2. Auto Filter after: LP base 3–5 kHz, envelope follower sidechained from the kick, negative amount, so each kick darkens the tail.
3. Automate the return LP between 1.5 kHz (verse) and 8 kHz (break) for a “room opening” moment without touching any instrument.

Mid/Side filtering with EQ Eight

Filter the sides and the mid differently: dark centre, bright edges, or a side-only HP that sweeps up to make the stereo field shrink before a drop. It is spatial filtering: the music moves forward or back without changing its tone in mono.

1. EQ Eight mode M/S. Band 1 Side, low cut 200–400 Hz, 24–48 dB: always mono-safe lows.
2. Band 8 Mid, high cut 2–4 kHz, 12 dB: the centre becomes dark and leaves 3–6 kHz for the hats; the sides stay airy.
3. Automate the Side low cut from 300 Hz to 2 kHz over 8 bars before a breakdown: the image narrows to a core, then snap back on the downbeat.
4. For filter motion on sides only: a Rack with two chains, Utility mid-only and side-only (or EQ Eight M/S split), Auto Filter with LFO only on the side chain.

Filter + Gate for chopped textures

A held, filtered drone gated by a rhythmic trigger track becomes a percussive stab sequence that still has the drone’s slow filter motion inside it: two time scales in one element.

1. Create a MIDI track with Drum Sampler/Simpler playing short clicks in a syncopated pattern; set its output to “Sends Only” or mute its audio via Utility.
2. Gate on the drone, sidechain from that track. Hold and Release define the chop length.
3. Put the slow filter before the Gate. Add Echo after the Gate so chops bloom into tails.
4. Gate’s Flip mode inverts: drone plays in the gaps of the trigger, a nice trick against the hat pattern.

Resampling filter sweeps, then re-pitching

Record a long, played filter sweep (with resonance, delay tails, live tweaks) to audio, then re-pitch and warp it. Pitched down an octave with Complex Pro off (Re-Pitch warp), the sweep becomes slower, darker and grainier: a texture you cannot get from automation.

1. New audio track, input Resampling (or the chord track post FX). Record 32–64 bars of you riding cutoff/res/feedback by hand.
2. Cut the best 4–16 bars. Drop into Simpler; Warp mode Re-Pitch so pitch and speed are linked; transpose −12 or −7.
3. Alternatively Bounce in Place (12.2) on the track, then reverse the clip: a reversed filter-close becomes a filter-open riser that ends in a resonant ping.
4. Sampler: map different sweep fragments across keys; play them as a dub chord “instrument”.

Filter automation curves (Live 12) vs modulation

Automation draws an absolute path; modulation offsets relative to the current value. Use automation for arrangement-scale moves (64-bar opening) and modulation for performance and repeating motion, so you can still grab the knob live.

1. Curves: in an automation lane, Alt/Option-drag a segment to bend it. Concave (slow then fast) for openings; convex for closes that need to get dark quickly.
2. Shapes: right-click an automation lane selection to insert preset shapes (sine, triangle, sawtooth, square, ADSR-like) scaled to the time selection; good for 4–8 bar wobbles without an LFO.
3. Modulation mode: in clip envelopes, switch from Automation to Modulation for cutoff so the clip’s envelope offsets around whatever the knob is set to. Session clips then breathe while you still move cutoff by hand.
4. Hand-recorded automation via Push/controller, then thin it with Simplify Envelope (context menu) for clean, editable curves.
5. Rule of thumb: frequency automation should look curved on a linear lane because human hearing is logarithmic; Live’s cutoff knobs are already exponentially scaled, so a straight line on the knob is fine — check by listening, not by looking.

Macros with nonlinear and inverted ranges

One macro, many mappings with different and inverted ranges: as the knob goes up, LP opens, HP closes slightly, resonance drops, delay feedback rises, reverb return LP opens. A single “depth” control that does the right thing musically across its whole travel.

1. Map Macro 1 to several parameters. In the Mapping browser set each Min/Max. Setting Min above Max inverts that mapping.
2. Compensate level: as LP closes, perceived loudness drops; map Utility gain inverted (+2 dB at closed) to keep the element present.
3. Split-range (DJ knob): nest racks. Outer macro drives two inner macros; on the inner rack, map LP cutoff with Min 20 kHz/Max 150 Hz and limit the outer mapping range to 0–63; HP with the 64–127 range. Or use the Chain Selector with two Auto Filter chains and zone fades for a no-maths version.
4. Use Macro Variations to store “dark verse”, “open break”, “dub tail” states and recall them on Push.

Push performance mapping for filters

A live deep techno set is mostly filter riding. Set up every group so the first eight macros on Push are the same layout, and your hands learn one map for the whole set.

1. Rack every group (drums, bass, chords, FX) with this macro layout; Push shows rack macros first when the rack is selected.
2. Use Push’s touch-sensitive encoders: touching an encoder while a clip has modulation lets you take over.
3. Pads: map EQ Three kills and Auto Filter LFO on/off to Push pads via a Drum Rack trick or MIDI mapping from a controller; or use Push 3’s Session-mode with dedicated clips that contain only filter clip envelopes.
4. Record performance into Arrangement and keep it: the imperfect hand curves are the record.

Modular VCF via External Audio Effect

Hardware VCFs (ladder, OTA, vactrol low-pass gates, SEM-style state variables) still do something digital filters approximate: unstable resonance, hot-input clipping, cross-modulation with CV. Use them on chords and drums via External Audio Effect, with modulation from CV Tools or eurorack LFOs.

1. External Audio Effect: Audio To = interface outs to the VCF, Audio From = interface ins. Set Hardware Latency with the latency-test method so the filtered signal lines up.
2. Gain: line level is hot for eurorack inputs at the wrong end; use the Gain controls and an attenuator so the VCF clips only when you want it to.
3. CV Tools: CV LFO or CV Envelope Follower (from the kick) out through a DC-coupled output to the cutoff CV input; synced divisions like 3/16 still work.
4. Note: a Buchla 258-style module is an oscillator, not a filter; pair it with an external VCF or low-pass gate (Buchla 292-style vactrol LPG is the classic “bongo” dub ping). Qu-Bit Nautilus (delay network with filtering per line) and Mojave (granular) behave filter-ish: insert them the same way as dub delay/texture processors.
5. Print the result (record the return) once happy; hardware sends are not recallable.

Rumble filter for the kick (send-based)

Specific kick-rumble recipe: the kick sends to a short-to-long reverb, the return is distorted, low-passed and ducked so the rumble fills the gap between kicks with tonal sub pressure in key.

1. Send 0 dB from the kick. Reverb 100% wet, 2–6 s.
2. Roar distortion makes the tail a dense tone; the LP at 120–200 Hz with mild resonance tuned near the track key (e.g. F at 87 Hz × 2 = 175 Hz) turns noise into a pitched rumble.
3. HP at 30–40 Hz so the rumble cannot stack on the sub.
4. Sidechain hard (10–20 dB GR) so the rumble only lives between kicks. Release decides the groove: shorter = rolling, longer = pumping.
5. Automate the LP cutoff 120 → 300 Hz across a build; the rumble “rises” without any new sound.

“Breathing” pads: slow filter + amp LFO in phase / out of phase

Pads breathe when cutoff and level move together (in phase: louder = brighter, natural like an acoustic instrument) or swell oddly when they oppose (out of phase: louder = darker, a pressure that hides itself). Both are slow — 2 to 8 bars per cycle.

1. Auto Filter LFO: sync 2–8 bars, sine. Note its phase setting.
2. Auto Pan-Tremolo (12.3) in tremolo mode: same rate and shape, depth 20–40%. Align phase for “in phase”; offset by 180° for “out of phase”. Older Live: Auto Pan with Phase 0° (both channels same) works as a tremolo.
3. Retrigger both from the clip or use the M4L LFO mapped to both parameters (one LFO, two mappings, one inverted) for guaranteed phase lock.
4. Slight offset (e.g. filter 4 bars, tremolo 3 bars) gives a slowly evolving phase relationship.

Vocoder as a rhythmic filterbank

Put the Vocoder on a chord pad, carrier = the pad (External or the track itself), modulator = the drum bus via sidechain. The pad’s spectrum is chopped by the drums’ spectrum: hats open the top bands, kicks the low bands. A filter animation no LFO can draw.

1. Bands 12–20 for a smoother, filter-like result; 40 is more “robotic”.
2. Release 80–200 ms: long enough to sound like a filter, short enough to keep rhythm.
3. Formant shift down slightly (−1 to −3) to darken; Dry/Wet 30–50% keeps the pad’s body.
4. Swap the modulator to a hat-only bus for top-end-only animation.

Velocity- and envelope-driven filter stabs

Per-note filter envelopes make a static chord pattern feel played: accented notes open further, ghost notes stay dull. In a 1-chord track this velocity layer is a whole dimension of expression.

1. Drift/Wavetable: filter envelope A 0–3 ms, D 150–400 ms, S 0–10%. Envelope amount 40–70%.
2. Route velocity to envelope amount (or directly to cutoff) at 40–60%.
3. Velocity device with Random 15–25 or the Velocity Shaper transformation for structured accent patterns.
4. Operator: loop the filter envelope (Loop mode) at a synced time to get rhythmic filter movement from a held chord.