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Tutorial 004 / Ableton Live

Build a Three Octave Bass

A dark monophonic bass made with three saw waves, a closing filter envelope and Saturator.

3 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 / 3

Stack three saw waves

Load Operator in Live 12 Suite.

Click Operator’s lower-right global area. Choose algorithm 11, the far-right diagram with four oscillators side by side. Each oscillator feeds the output independently. Enable A, B and C and switch D Off.

Select Saw D for each active oscillator, then enter:

Oscillator Coarse Fine, Operator units Level
A 1 0 −9.1 dB
B 2 1 −9.1 dB
C 4 0 −9.1 dB

Set Transpose −24 st, Tone 100%, Volume −15 dB and Spread 0%. These ratios place the oscillators two octaves below the played note, one octave below it, and at the played pitch. B’s Fine 1 adds a small tuning offset and slow beating; this value is an Operator control value, not one cent.

In the global display, set Voices 1, global Retrig Off, interpolation and antialias On, Pan centered, Pan < Key 0, Pan < Rnd 0, Time 0% and Time < Key 0%. Set the pitch-bend range to 2 st. Keep Glide, Pitch Env, LFO, Filter and Shaper Off.

For A, B and C, keep Fixed Off, frequency quantization On, oscillator Retrigger Off, Phase 0%, Feedback 0%, Level < Velocity 0%, Level < Key 0% and frequency/velocity modulation 0. Set each amplitude envelope to:

Envelope control Value
Attack 2.00 ms
Decay 500 ms
Sustain / Peak 0 dB / 0 dB
Release 44.9 ms
Initial / End −∞ dB / −∞ dB
Loop None
Attack / Decay / Release slopes 0% / 100% / 100%
Time and release velocity scaling 0%

Peak and sustain are equal, so the amplitude stays steady while a note is held. The short release makes the bass stop quickly when you lift a key. The filter added in step 2 will shape the attack’s brightness.

These screenshots show the finished instrument’s amplitude and global panels. Keep Filter Off for step 1, even though it is enabled in the pictures.

Operator amplitude envelope: three saw oscillators with a short release
Operator amplitude envelope: three saw oscillators with a short release · Select image to enlarge
Operator global panel: parallel routing, one voice and two octaves of transposition
Operator global panel: parallel routing, one voice and two octaves of transposition · Select image to enlarge

Hear step 1:

Play or download step 1 WebM

Next: Close the filter after the attack →

Step 02 / 3

Close the filter after the attack

Enable Operator’s Filter and click its section to open the central controls.

Filter control Value
Type / Slope Lowpass / 24 dB
Circuit PRD
Frequency 1.00 kHz
Resonance 0%
Drive 12 dB
Keyboard tracking 100%
Velocity tracking 15%
Envelope amount 24%
LFO modulation Off

Keep Transpose −24 st and keyboard tracking 100% together with the displayed 1.00 kHz cutoff: pitch tracking changes the filter’s operating frequency as you play. Higher velocities raise the cutoff slightly.

Set the filter envelope to:

Envelope control Value
Attack 2.00 ms
Decay 2.20 s
Sustain 0%
Release 44.9 ms
Initial / Peak / End 0% / 100% / 0%
Loop None
Attack / Decay / Release slopes 0% / 100% / 100%
Release velocity scaling 0%

The envelope opens the filter at the beginning of the note, then closes it toward the sustained cutoff. The curved decay concentrates much of the brightness change near the attack. The amplitude envelope still holds its level, leaving a dark body after the brighter opening.

Operator filter: PRD lowpass, drive and a descending filter envelope
Operator filter: PRD lowpass, drive and a descending filter envelope · Select image to enlarge

Hear step 2:

Play or download step 2 WebM

Next: Add saturation and play the bass →

Step 03 / 3

Add saturation and play the bass

Add Saturator after Operator and set:

Saturator control Value
Curve Analog Clip
Drive +12 dB
Output −11 dB
Dry/Wet 100%
Color Off
DC filter On
Output clip mode No Clip
High Quality On, in the device context menu

Drive pushes the waveform into the clipping curve, rounding peaks and adding harmonics. The Output control brings the level back down afterward. Keep Color Off so its frequency shaping stays inactive.

Saturator: Analog Clip with 12 dB of drive and reduced output
Saturator: Analog Clip with 12 dB of drive and reduced output · Select image to enlarge

Hear step 3:

Play or download step 3 WebM

The final signal order is three parallel Operator saw waves → Operator’s driven lowpass filter → Saturator.

Play C2 / MIDI 48, C3 / MIDI 60 and G3 / MIDI 67, then try C3 at velocity 65 and 100 to vary the brightness. Use short notes for rhythmic bass lines or hold a note to expose the slow oscillator beating. Try overlapping C3 and E3: with one voice enabled, only one note sounds at a time. Keep Glide Off for immediate pitch changes.

Audio & settings ↓

Audio & settings

Audio recordings and settings for this tutorial.