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Tutorial 002 / Ableton Live

Build a Hollow Pulse Bass

A short, hollow Operator bass with a bright edge, a swelling fourth harmonic and a dark finish.

6 stepsOperatorLive 12 Suite

Listen to the finished sound

Download WEBM ↓

Follow the synthesis steps in order. Use the audio examples and device screenshots alongside the settings.

Step 01 / 6

Make the rounded bass body

Load the plain Operator instrument in Live 12 Suite.

Click Operator's lower-right global area. Select algorithm 11, the far-right diagram with all four oscillators side by side. They now mix directly into the output. Set Voices 6, global Retrig Off, interpolation On, antialias On, Tone 100%, Spread 0%, Transpose 0 st, and Volume −12 dB. Set Time, Time < Key, Pan < Key and Pan < Rnd to 0. Leave the global modulation matrix at its default: velocity/aftertouch/mod-wheel connections Off, Key → Time at 0%, and Pitch Bend → Pitch at +5 st.

Switch B, C, D, Filter, LFO and Pitch Env Off. Enable A, choose Sine, and set Coarse 2, Fine 0, Level 0 dB, Fixed Off, frequency quantization On, retrigger On, Phase 0%, Feedback 0%, frequency-to-velocity 0, and Key 0%.

Give A this envelope: Attack 2.00 ms, Initial −∞ dB, Peak 0 dB, Decay 1.00 s, Sustain −3.5 dB, Release 25.0 ms. Set Loop None, Repeat Off, Vel 35%, Time < Vel 0%, and Release < Vel 0%. Retain the standard amplitude curves: linear attack and exponential decay/release. User-saved defaults can differ; the starting settings collect these controls.

Although A is an octave above the played note, a quieter fundamental will join it in step 3.

Operator A: sine body, parallel routing and short amplitude envelope
Operator A: sine body, parallel routing and short amplitude envelope · Select image to enlarge

Hear step 1:

Play or download step 1 WebM

Next: Give the body a bright edge →

Step 02 / 6

Give the body a bright edge

In A's central panel, change Wave from Sine to Saw 64, displayed as Sw64. Keep Coarse 2, Level 0 dB and the envelope from step 1.

This waveform adds a row of harmonics above the strong second harmonic. The sound is deliberately brighter here; the filter added later will close over the note.

Operator A: Saw 64 with the same amplitude envelope
Operator A: Saw 64 with the same amplitude envelope · Select image to enlarge

Hear step 2:

Play or download step 2 WebM

Next: Add the hollow harmonic balance →

Step 03 / 6

Add the hollow harmonic balance

Enable B and C and set them separately:

Control B C
Wave Saw 64 / Sw64 Sine / Sin
Coarse 3 1
Fine 0 0
Level −6.5 dB −15 dB
Attack 2.00 ms 2.00 ms
Decay 1.00 s 1.00 s
Sustain −2.5 dB −2.5 dB
Release 25.0 ms 25.0 ms

For both oscillators, use Initial −∞ dB, Peak 0 dB, Loop None, Repeat Off, Vel 35%, Key 0%, and both envelope time/release velocity amounts 0%. Set Fixed Off, frequency quantization On, retrigger On, Phase 0%, Feedback 0%, and frequency-to-velocity 0.

B adds the third harmonic and reinforces shared upper harmonics. C supplies the actual fundamental at a much lower level. The result stays hollow because the octave component remains stronger than the root.

Operator B: third-harmonic saw layer, with the quiet C fundamental enabled
Operator B: third-harmonic saw layer, with the quiet C fundamental enabled · Select image to enlarge

Hear step 3:

Play or download step 3 WebM

Next: Swell the fourth harmonic →

Step 04 / 6

Swell the fourth harmonic

Enable D. Choose Sine, Coarse 4, Fine 0, and Level −10 dB. Use the same oscillator switches, phase, feedback and velocity settings as B and C.

Set D's envelope to Attack 280 ms, Initial −∞ dB, Peak 0 dB, Decay 120 ms, Sustain −∞ dB, and Release 25.0 ms. Keep Loop None and Repeat Off.

The slower attack brings in a rounded middle to the note. D then fades away, allowing the fourth harmonic to recede before the note ends. This is amplitude movement in one oscillator; no LFO is needed.

Operator D: a slow sine swell followed by a short decay to silence
Operator D: a slow sine swell followed by a short decay to silence · Select image to enlarge

Hear step 4:

Play or download step 4 WebM

Next: Close the filter over the note →

Step 05 / 6

Close the filter over the note

Enable Filter, then click its section to reveal the filter envelope. Select Lowpass, 12 dB, Clean, Frequency 280 Hz, and Resonance 0%. Set frequency key tracking and frequency velocity tracking to 0%. Keep filter LFO modulation Off and Shaper Off, with drive 0 dB and Dry/Wet 100%.

Filter-envelope control Value
Amount 55%
Attack 0.00 ms
Initial / Peak 100% / 100%
Decay 480 ms
Sustain / End 0% / 0%
Release 50.0 ms
Attack / Decay / Release slope 0% / 0% / 100%
Loop / Repeat None / Off
Time < Vel / Release < Vel 0% / 0%

The envelope raises the cutoff at the start, then brings it back toward 280 Hz. The bright edge gives way to the bass body over roughly half a second. The envelope's Decay slope is 0%: drag its middle slope handle until the segment is straight.

Operator filter: Clean 12 dB lowpass and descending filter envelope
Operator filter: Clean 12 dB lowpass and descending filter envelope · Select image to enlarge

Hear step 5:

Play or download step 5 WebM

Next: Add a small tuning drift and set the output →

Step 06 / 6

Add a small tuning drift and set the output

Enable Pitch Env and set its main Amount to 1.0%. Click the pitch-envelope section; its central panel is labelled Aux in this version of Live.

Pitch-envelope control Value
Attack 0.00 ms
Initial / Peak −5 st / −5 st
Decay 500 ms
Sustain / End −18 st / −18 st
Release 50.0 ms
Attack / Decay / Release slope 0% / 0% / 100%
Destination A A, B, C and D On; LFO Off
Destination A amount 100%
Destination B Off
Loop / Repeat None / Off
Time < Vel / Release < Vel 0% / 0%

At 1%, those envelope levels produce approximately −5 cents at the start and −18 cents at the end, rather than a large pitch fall. Set the Decay slope to 0%, so the envelope segment is straight. Keep Glide Off, LFO Off, and Spread 0%.

Raise Operator's Volume to −8.0 dB. The full signal order is now four parallel oscillators → Operator's lowpass filter → Operator output, with no extra effects.

Operator pitch envelope: small amount, all four oscillator destinations enabled
Operator pitch envelope: small amount, all four oscillator destinations enabled · Select image to enlarge

Hear step 6:

Play or download step 6 WebM

Play C1 / MIDI 36, D#1 / MIDI 39 and G1 / MIDI 43. Lower D#1's velocity to 70 for a softer note. Hold notes longer to sustain A, B and C while D fades away. When playing far above this bass range, raise the filter cutoff to retain brightness.

Audio & settings ↓

Audio & settings

Audio recordings and settings for this tutorial.