Tremolo Effect
Volume pulsing, not pitch. Tremolo modulates amplitude with an LFO. Learn rate, depth, waveform, BPM sync, and when to use tremolo vs vibrato.
What Is the Tremolo Effect?
Tremolo is amplitude modulation: an LFO (Low-Frequency Oscillator) continuously raises and lowers the volume of your signal at a set rate and depth. The result is a rhythmic pulsing or wavering volume that ranges from a gentle shimmer to an aggressive chop.
Tremolo vs Vibrato: The Most Confused Pair in Music
Tremolo = volume changes. Vibrato = pitch changes. Both use an LFO, but they target completely different parameters. Fender's vintage amps famously had the labels reversed on the Tremolux and Vibrolux, cementing the confusion for decades.
What Fender called "Vibrato" on the Vibrolux was actually tremolo (amplitude modulation). What they called "Tremolo" on the Tremolux was... also tremolo. Leo Fender reportedly swapped the names by mistake. True vibrato requires pitch deviation.
Tremolo vs Vibrato: Full Comparison
| Parameter | Tremolo | Vibrato | Note |
|---|---|---|---|
| What changes | Volume (amplitude) | Pitch | This is the core difference |
| LFO target | VCA (amplifier) | Oscillator pitch / delay time | |
| Rate | 0.5-20+ Hz | 4-8 Hz typical | Tremolo can go very fast (trill) |
| Depth | Volume swing amount | Pitch deviation (semitones) | |
| Waveform | Sine / Triangle / Square | Sine / Triangle | Square = tremolo picking effect |
| Mono safe | Yes | Yes | Neither causes phase cancellation |
| Famous use | Boulevard of Broken Dreams, How Soon Is Now | Pink Floyd solos, Vibrato pedal |
Tremolo Waveform Shapes
The LFO waveform determines how the volume change is shaped over each cycle. Three shapes cover virtually all use cases.
Rate Settings Guide
Rate controls how fast the LFO oscillates. Measured in Hz (cycles per second) or as a BPM subdivision when synced to tempo.
| Rate | Feel | Best Use |
|---|---|---|
| 0.5-1.5 Hz | Slow, surging pulse | Ambient pads, slow ballads, film score |
| 1.5-3 Hz | Gentle wave, classic tremolo feel | Clean guitar, reggae, country, neo-soul |
| 3-6 Hz | Moderate pulse, rhythmic | Electric guitar, keys, synth pads |
| 6-10 Hz | Fast, anxious, shimmer | Indie rock, post-punk, surf guitar |
| 10+ Hz | Blur into tone color, trill effect | Experimental, ambient, noise |
Depth Settings Guide
Depth controls how much the volume swings on each LFO cycle. 0% = no effect. 100% = the signal drops to complete silence at the LFO trough.
| Depth | Feel | Best Use |
|---|---|---|
| 0-20% | Barely noticeable volume flutter | Subtle movement on vocals, pads, very light guitar |
| 20-40% | Gentle pulsing, adds life without drama | Country, rockabilly, clean guitar, background elements |
| 40-60% | Classic tremolo, clear volume wave | Electric guitar, Rhodes, synth leads |
| 60-80% | Dramatic, choppy, percussive | Indie rock, post-punk, guitar in the verses |
| 80-100% | Full chop: gate-like, near silence at bottom | Surf rock, stutter effects, choppy synth chops |
BPM-Synced Tremolo
Syncing tremolo to your DAW BPM locks the volume pulse to your track's rhythm. This is especially useful for reggae/ska guitar chops, electronic stutter effects, and rhythmic synth pads.
BPM Subdivisions
- 1/4 noteOne pulse per beat. Slow, dramatic.
- 1/8 noteTwo pulses per beat. Classic reggae/ska chop.
- 1/16 noteFour pulses per beat. Fast stutter or shimmer.
- 1/4 dottedSyncopated off-beat pulse. Interesting in funk.
How to Enable BPM Sync
- Open your tremolo plugin in the DAW
- Look for a "Sync" or "Tempo" button and enable it
- Set Rate to the desired subdivision (1/8, 1/4, etc.)
- Set Waveform to Square for a hard chop, Sine for a smoother pulse
- Set Depth to 60-80% for a reggae chop, 30-50% for rhythmic pads
Use the BeatKey Delay Calculator
If your tremolo plugin uses milliseconds instead of note values, the BPM to MS chart converts any BPM to exact subdivision timings. Useful when setting rate in ms mode on hardware or older plugins.
Tremolo Settings by Genre
Classic Fender-amp tremolo sound. Medium rate, moderate depth. The "Tremolux" setup of 50s rock and country.
Faster rate, heavier depth. Square wave at high depth gives a choppy percussive stutter effect common in surf and indie.
BPM-synced square wave tremolo on the guitar chop is a defining reggae and ska sound. Set to 8th note subdivision.
Very slow tremolo on ambient pads gives them a breathing quality. Keeps pads interesting without adding rhythm.
Subtle tremolo on lead vocals adds emotion and instability. Popularized by post-punk and indie artists.
BPM-synced square wave tremolo at 100% depth on a drum loop creates a choppy gate/stutter effect.
Tremolo on Rhodes or organ creates the classic Leslie-style amplitude pulsing. Not the same as a Leslie, but a good substitute in the box.
Famous Tremolo Sounds
The main guitar uses amp tremolo for the eerie, distant tone. Slow rate with moderate depth creates the song's signature lonely feel.
Johnny Marr's tremolo is actually multiple guitar tracks with offset tremolo rates, creating a wash of pulsing volume. One of the most iconic tremolo guitar sounds in rock.
Surf rock tremolo at fast rate, heavy depth. The Fender amp tremolo shaping the entire genre. Popularized by Pulp Fiction.
Slow tremolo applied to clean guitar parts throughout the album for the melancholy, restless quality. Thom Yorke's guitar setup.
Fender Tremolux amp tremolo. Classic rockabilly and 50s rock and roll tremolo tone. Medium rate, moderate depth.
The Hohner clavinet in Low Rider uses tremolo-like note chopping. The LFO-controlled amplitude chop is a defining funk keyboard technique.
6 Production Tips for Tremolo
Send bass to a parallel bus with tremolo at 100% depth. Blend at 20-30%. This adds rhythmic movement without gutting the low end of the dry signal.
When using BPM sync, start the tremolo on a downbeat (hit play at the beginning of a bar). If the pulse feels off, nudge the plugin's phase offset parameter to align it.
Automate tremolo depth to ramp from 0% to 80-100% going into a drop or chorus. The increasing volume flutter builds tension. Return to 0% after the drop hits.
Square wave tremolo at 100% depth is effectively a rhythmic gate. Use it on a synth pad or guitar loop for a choppy electronic stutter effect without a dedicated gate plugin.
Some stereo tremolo plugins let you set the phase offset between L and R channels. At 180 degrees offset, the left and right volumes alternate creating wide stereo movement (like a ping-pong but with volume).
When working with samples, detect the key with BeatKey first so you know your tonal context. Then add tremolo to elements that benefit from rhythmic movement without clashing with your chord structure.
Use the BeatKey Delay Calculator
If your tremolo plugin syncs to ms instead of BPM note values, the delay calculator converts any BPM to exact millisecond timings for any subdivision.
Related Modulation Guides
Tremolo Effect FAQ
What is the difference between tremolo and vibrato?
Tremolo modulates volume (amplitude). Vibrato modulates pitch. Both use an LFO, but tremolo targets the amplifier (VCA) while vibrato targets the oscillator pitch. Fender's vintage amps famously swapped the labels, causing lasting confusion.
What rate should I use for tremolo?
For classic guitar tremolo: 3-6 Hz with sine wave. For fast surf or indie stutter: 6-10 Hz with square wave. For ambient pads: 0.5-2 Hz slowly. For BPM-synced reggae or ska guitar chops: set to 8th note subdivision in your DAW.
Does a Fender amp vibrato actually make vibrato?
No. Fender's "Vibrato" channel on vintage amps produces tremolo (amplitude modulation). Leo Fender reportedly swapped the labels on the Tremolux and Vibrolux by mistake. True vibrato requires pitch modulation, which most tremolo pedals and amp circuits don't produce.
How do I sync tremolo to BPM?
In your DAW tremolo plugin, enable BPM/host sync and select the subdivision: 1/4 note for a slow pulse, 1/8 note for a moderate chop, 1/16 note for a fast stutter. Square waveform at high depth gives a gate-chop effect. The BPM to MS chart above converts subdivisions to milliseconds if your plugin uses ms.