ABLETON 12 SOUND DESIGN ATLAS
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Sub Bass Rack

Three-chain Instrument Rack (sine sub, harmonic mid layer, transient click) with six macros that cover tuning, drive, glide and mono-safe width.

subbassrackoperatordrift808dubsteptechnogrimemacros

A sub rack that you build once and never rebuild: a clean sine below 100 Hz, a separately controllable harmonic layer that makes the note readable on small speakers, and a tiny click so the attack lands on the grid. Six macros do all the sound design you need during a session — Tune for 808-style pitch drops and per-set tuning, Drive for grit, Harmonics for the mid layer level, Glide for 303/UK-bass slides, Width above 150 Hz for stereo that stays mono-safe, and Decay to go from sustained techno sub to one-shot 808 tails. Use it for dubstep, grime, UK bass, deep techno, dub techno and halftime; swap the Variations section below for trap and DnB builds.

Layout

How it's built

  1. Create a MIDI track, drop an empty Instrument Rack from the browser (or select a device and press Cmd+G). Show the chain list, right-click it and Create Chain three times. Name them Sub sine, Mid harmonics, Click.
  2. Sub sine chain: load Operator. Algorithm 1 (A only, leftmost). Osc A waveform Sine, Coarse 1, Fine 0, Level 0 dB. Global Transpose −12. Amp envelope A 2 ms, D 600 ms, S 1.0, R 80 ms. Voices 1 (mono) and Retrigger off so legato notes slide instead of restarting. Glide on, time 0 ms (the macro will open it).
  3. Still on the sub chain: EQ Eight after Operator. Band 1 low cut 24 dB/oct at 22 Hz (removes DC and sub-sub rumble that eats limiter headroom), band 8 low pass 24 dB/oct at 120 Hz. Then Utility with the Mono button engaged. This chain must never be wider than mono.
  4. Mid harmonics chain: Operator with algorithm B→A (second from left). Osc A sine at 0 dB, Osc B sine Coarse 2 (one octave up), level −18 dB. This gives soft FM harmonics that track the note. Transpose 0 — this layer sits one octave above the sub and carries the pitch information on phones and laptops.
  5. Add Saturator after it: curve Analog Clip, Drive 0 dB (macro drives it), Output −3 dB, Soft Clip on. Then EQ Eight: high cut off, low cut 24 dB/oct at 90 Hz so it never fights the sine, and a gentle 12 dB/oct low pass at 2.5 kHz. Then Utility: Bass Mono on, frequency 150 Hz, Width 100%.
  6. Click chain: Operator with Osc A waveform Noise (white), amp envelope A 0 ms, D 8 ms, S 0, R 10 ms. Enable the Operator filter: HP 12 dB at 1.2 kHz. Set the chain’s velocity zone to 80–127 in the Velocity tab of the chain list, so ghost notes play sub only.
  7. Set all three key zones to C0–C4 (Key tab). Chain volumes: Sub 0 dB, Mid −12 dB, Click −18 dB. Pan all centre.
  8. Click Map on the rack’s macro panel. Macro 1 Tune: click Transpose on each of the three Operators, then map each. In the mapping browser set Min −12, Max +12 for the sub and mid; for the click Operator leave it unmapped (noise has no pitch worth tracking).
  9. Macro 2 Drive: Saturator Drive, Min 0 dB, Max 18 dB; plus the mid chain’s Osc B level Min −24 dB, Max −10 dB. One knob adds both FM harmonics and clipping — the two grow together, which is what the ear expects from an overdriven bass amp.
  10. Macro 3 Harmonics: map the Mid harmonics chain volume slider in the chain list, Min −inf, Max −6 dB. The sub stays fixed; only the readable layer moves.
  11. Macro 4 Glide: Operator Glide time on sub and mid, Min 0 ms, Max 250 ms. Keep the click out — a gliding noise burst sounds wrong.
  12. Macro 5 Width >150: the mid chain Utility Width, Min 0%, Max 140%. Because Bass Mono is set at 150 Hz, anything below stays summed no matter where this knob sits.
  13. Macro 6 Decay: Operator Amp Decay on sub and mid, Min 120 ms, Max 4000 ms, and Amp Sustain Min 0, Max 1. Because both map to one knob, at the bottom you get an 808-style one-shot (short decay, no sustain) and at the top a held techno sub.
  14. Right-click the Tune macro and choose Exclude Macro from Randomization; do the same for Glide. Now the rack’s randomize button (the dice) only shuffles timbre, never the key or timing.
  15. Open Macro Variations (the star button). Store four: Techno (Drive 0, Harmonics 30%, Decay 100%), 808 (Tune 0, Drive 40%, Decay 15%, Glide 20%), Grime (Drive 70%, Harmonics 80%, Width 0), Dub (Drive 10%, Harmonics 10%, Decay 60%). Recall them from the variation list or map them to Push pads.
  16. Group-save: name the rack Sub Bass Rack and save it to User Library via the save icon on the title bar. Set the macro count to 6 with the +/− buttons before saving so the panel stays tidy on Push.

Macro map

MacroDevice.parameterMinMaxWhy
TuneOperator.Transpose (sub, mid)−12 st+12 stOctave range covers 808 drops and re-keying; centre = unity.
DriveSaturator.Drive / Operator.Osc B level (mid)0 dB / −24 dB18 dB / −10 dBFM index and clipping rise together; harmonics appear above 150 Hz where the mid chain lives.
HarmonicsChain Mid harmonics.Volume−inf−6 dBSmall-speaker readability without touching the sine.
GlideOperator.Glide time (sub, mid)0 ms250 ms250 ms is a sixteenth at 60 BPM — covers any slide you want at 140.
Width >150Utility.Width (mid)0%140%Bass Mono at 150 Hz guarantees the low end stays mono; width only affects harmonics.
DecayOperator.Amp Decay + Amp Sustain120 ms / 04 s / 1One knob between one-shot 808 and held sub.

Signal flow notes

Sub sine chain

Keep the sine at exactly 0 dB in Operator and set level with the chain fader, so the Drive macro never clips the sub itself. If your kick is tuned (say F at 43.7 Hz), tune the sub a fifth or octave away; see note-to-Hz.

Mid harmonics chain

Click chain

The ear localises pitch from harmonics, not the fundamental. A sine at 41 Hz on a phone speaker is silence; the same note with a −12 dB second and third harmonic is readable. Splitting these into chains lets you mix them per track instead of per patch.
Do not put Drive on the sub chain. Clipping a 40 Hz sine makes odd harmonics at 120 and 200 Hz that collide with the kick body and smear the mono image.

Variations

Performance notes

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