Sub-bass sine reinforcement blends a pure or low-pass filtered sine wave tone beneath higher-register instruments such as acoustic pianos or electric basses. Because the sine tone contains no upper harmonic clutter, it imparts a deep, modern low-end weight without altering the acoustic character of the primary instrument. It is commonly layered to sustain foundational energy as an arrangement builds.
How the songs in the archive use it
lovely and Someone You Loved introduce low-frequency sine tones directly under acoustic piano chords and octaves to provide sub-bass weight, whereas Sunflower doubles an analog sine patch under a live Fender Precision Bass and runs it through a Teletronix LA-2A for sustained low end.
How to do it in Logic Pro
Sub-bass sine reinforcement doubles a mid-focused acoustic or electric instrument with a pure synth tone to inject weight without clutter. Use it on acoustic pianos or weak bass tracks for modern low-end foundation.
Create a new Software Instrument track loaded with ES M to play the sub reinforcement line.
Duplicate or mirror the root MIDI notes from your main instrument onto the ES M track.
Set the ES M octave to 32 to pitch the oscillator deep into the sub-bass register.
Lower ES M Cutoff to filter away high harmonics, leaving a rounded sine-like tone.
Insert Channel EQ on the reinforced instrument track and engage Band 1 On/Off to clear room for the new sub layer.
Plug-in
Control
Value
Listen for
ES M
32
On
deep, rumbling low-end octave foundation
ES M
Cutoff
12
filtered, clean sub tone free of midrange buzz
Channel EQ
Band 1 On/Off
On
removal of competing sub rumble on the primary instrument track
Channel EQ
Frequency
80 Hz
clean separation between the acoustic instrument and the ES M sub
A general method with Logic Pro's own plug-ins. Control names are checked against Apple's manual; the values are starting points, so adjust them by ear.
Songs that use it (4)
What each track sheet's analysis found, with the sheet's own score. Analysis, not verified credits.
Sunflower by Post MaloneSubharmonic Layered Bass: Live Fender Precision Bass doubled beneath an analog sine wave patch, processed through Teletronix LA-2A for unified low-end sustain.Sheet score 6/10 · Source given: Corroborated by verified sister session logs for "Kill Bill"; Inferred: not confirmed against Discogs/MusicBrainz · Open the full track sheet
Someone You Loved by Lewis CapaldiSub-Bass Sine Reinforcement: Blending a low-pass filtered sine bass directly under acoustic piano octaves delivers modern low-end weight while maintaining an acoustic aesthetic.Sheet score 8/10 · Source given: soundonsound.com · Open the full track sheet
lovely by Billie EilishSub-Bass Sine Grounding: Blending a pure Omnisphere sine tone directly underneath acoustic piano block chords delivers immense sub-frequency club weight to an acoustic balladSheet score 8/10 · Source given: Production arrangement analysis · Open the full track sheet
Want these sounds in your own mixes? Every song above has a full track sheet with its signal chains and a step-by-step recreation for your DAW. Open Track DiveAll techniques