Phasers and flangers can both make a guitar sound as though it is spinning, sweeping or moving around the speakers. Set either effect gently and it can add life to an otherwise static clean tone. Increase the depth and feedback, and the same pedal can turn a distorted riff into a jet engine, a rotating speaker or a psychedelic wave.

Because the two effects occupy similar territory, guitarists often treat them as interchangeable. They are not. Phasers and flangers create movement through different processes, react differently with distortion, and suit different parts of a song. This guide explains where they came from, how to hear the difference, which guitarists helped make them famous, where they belong in a signal chain, and which phaser and flanger pedals are available through Music Bliss.

The first phasing and flanging sounds did not come from compact pedals. They grew from recording engineers experimenting with multiple playback machines, tape speed and the timing relationship between duplicated signals.

When two versions of the same recording play at almost the same time, small timing differences cause some frequencies to reinforce each other while others cancel. If that timing difference changes continuously, the pattern of peaks and notches moves through the frequency range.

That moving pattern creates the sweeping sound associated with phasing and flanging.

Early engineers produced these effects manually. Instead of turning a Rate knob, they changed the speed of one recording or playback machine relative to another. The effect could be beautiful, but it was difficult to reproduce exactly.

The development of dedicated studio processors and eventually guitar pedals turned that experimental technique into something musicians could control on stage.

The origin of flanging is often associated with early recording experiments by guitarist and recording innovator Les Paul during the 1940s and 1950s. However, several engineers and studios were experimenting with similar timing effects, so identifying one undisputed inventor is difficult.

The classic tape-flanging method uses two machines playing the same recording at the same time. An engineer slows one machine slightly, traditionally by applying pressure to the edge or flange of the tape reel.

As one copy moves behind the other, the two signals combine with a changing delay between them. This produces a deep series of evenly spaced frequency cancellations.

The result is the familiar:

• Jet-plane sweep.
• Metallic whoosh.
• Hollow comb-filtered movement.
• Rising and falling tunnel effect.

Toni Fisher’s 1959 recording “The Big Hurt” is commonly cited as one of the earliest hit records to feature an obvious flanging-style sound.

The technique became closely associated with the psychedelic studio experimentation of the 1960s. The Beatles and their Abbey Road engineers helped bring manipulated tape effects into popular music, while artists such as Jimi Hendrix used increasingly dramatic stereo movement as part of the recording itself.

Early phasing effects were also inspired by the moving cancellations heard when similar signals were combined. Instead of using a short delay, electronic phasers create frequency-dependent shifts through a series of filters.

One of the earliest significant studio processors was the Eventide Instant Phaser, introduced in the early 1970s. It recreated a sweeping phase effect electronically without requiring two tape machines.

Portable phase-shifting devices soon followed. The Maestro Phase Shifter PS-1, designed by Tom Oberheim, was among the important early units, while the MXR Phase 90 became one of the defining compact phaser pedals of the 1970s.

The Uni-Vibe also deserves mention. Developed in the late 1960s, it used an optical phase-shifting circuit to approximate the movement of a rotating speaker. Its uneven, throbbing modulation does not sound exactly like a conventional phaser, but it belongs to the same wider family of phase-based effects.

Once these sounds became available in pedals, guitarists could bring psychedelic studio movement into live performances without carrying a pair of tape machines.

The easiest explanation is:

A phaser changes the phase relationship of selected frequencies.

A flanger mixes the dry signal with a very short, continuously changing delayed copy.

Both effects create moving frequency cancellations, but the spacing and character of those cancellations are different.

How a phaser works

A phaser sends part of the guitar signal through a series of all-pass filters. These filters alter the phase of different frequencies without functioning like a conventional bass or treble EQ.

When the phase-shifted signal is combined with the dry signal, certain frequencies cancel. These cancellation points are called notches.

A low-frequency oscillator, or LFO, moves the phase relationship over time. This causes the notches to sweep through the frequency spectrum.

The effect often sounds:

• Smooth.
• Rounded.
• Liquid.
• Chewy.
• Vowel-like.
• Similar to a slow rotating speaker.

The number of filter stages influences the complexity of the sound. A two-stage phaser is usually subtle and open. A four-stage design produces the familiar classic pedal sweep. More stages can create a deeper and more complex movement.

How a flanger works

A flanger splits the signal and delays one copy by a very short amount, typically only a few milliseconds. The delay time is then modulated.

When the delayed and dry signals combine, they produce a series of regularly spaced peaks and notches known as a comb filter. On a frequency graph, this pattern resembles the teeth of a comb.

Because the effect produces many closely related cancellation points, a flanger usually sounds more metallic and pronounced than a phaser.

The effect often sounds:

• Jet-like.
• Hollow.
• Metallic.
• Mechanical.
• Dramatic.
• Similar to an aircraft passing overhead.

Many flangers also include a feedback or regeneration control. This sends part of the processed signal back through the circuit, making the peaks and notches more resonant.

At low feedback settings, a flanger can resemble a wide chorus. At high feedback settings, it can produce extreme metallic sweeps, robotic resonances and self-oscillating textures.

Play a sustained chord through each effect.

A phaser usually sounds as though the chord is gently rolling, breathing or rotating. The sweep feels blended into the original guitar sound.

A flanger usually creates a more obvious rising and falling whoosh. The guitar may sound hollow at one point in the sweep and sharply resonant at another.

Another useful comparison is:

• Phaser: smooth circles.
• Flanger: a jet passing through a tunnel.

These descriptions are subjective, but they help when learning to identify the two effects by ear.

Chorus and flanging both use modulated delay. The primary difference is generally the delay range and the amount of feedback.

A chorus uses a slightly longer delay, helping the processed signal feel like a second performance with subtle pitch movement.

A flanger uses a shorter delay, creating stronger comb filtering and a more metallic sweep.

At restrained settings, the boundary between chorus and flanger can become less obvious. Some flanger pedals can produce convincing chorus-like widening, while certain chorus units can approach gentle flanging.

A phaser does not rely on the same short-delay principle. Its movement comes from phase-shifting filter stages.

Eddie Van Halen

Eddie Van Halen helped make the phaser an essential part of hard-rock guitar. His use of the MXR Phase 90 can be heard on early Van Halen recordings, including the famous instrumental “Eruption.”

He did not always use the effect as an obvious psychedelic sweep. In many cases, the phaser added movement and a slightly vocal quality to an already distorted guitar sound.

This is an important lesson: a phaser does not need to dominate the tone. At moderate settings, it can make a sustained note or riff feel more animated without sounding like a special effect.

David Gilmour

David Gilmour used phase-based modulation to create spacious, flowing textures with Pink Floyd. His rigs included both Uni-Vibe-style effects and conventional phasing at different points in his career.

These effects complemented his sustained playing style because the slow movement continued changing underneath long notes and chords.

Jimi Hendrix

Jimi Hendrix is closely associated with the Uni-Vibe, particularly on songs such as “Machine Gun.” The effect’s uneven optical sweep became part of the vocabulary of psychedelic guitar.

Hendrix also embraced studio phasing and stereo movement. His recordings demonstrated that phase effects could be part of the arrangement and production, not merely an effect placed on one isolated guitar track.

Robin Trower

Robin Trower built a major part of his signature guitar sound around Uni-Vibe-style modulation. His playing helped establish the slow, deep phase sweep as a powerful sound for blues-rock leads and heavy chord work.

Waylon Jennings

Phasing was not limited to psychedelic rock. Waylon Jennings used it prominently in country music, where the moving texture became part of his distinctive electric-guitar sound.

Eddie Van Halen

Eddie Van Halen was also one of the most recognisable users of flanging. Songs such as “Unchained” helped establish the dramatic flanger sweep as a defining hard-rock sound.

His use of flanging demonstrated how well the effect can work with distorted rhythm guitar. The metallic sweep exaggerates pick attack and harmonic content, creating motion without requiring the guitarist to change the riff.

Andy Summers

Andy Summers of The Police used flanging as part of a wider palette of chorus, delay and modulation effects. His guitar sounds often occupied a large amount of space without relying on heavy distortion.

The opening texture of “Walking on the Moon” is strongly associated with his use of an Electro-Harmonix Electric Mistress-style flanger. The sound is broad, watery and atmospheric rather than aggressively jet-like.

David Gilmour

David Gilmour also used the Electro-Harmonix Electric Mistress family of effects. Its combination of flanging and chorus-like movement contributed to several spacious Pink Floyd guitar textures.

The Cure and Post-Punk Guitarists

Flanging also became important in post-punk and alternative guitar. Players used it to make clean and lightly driven guitars sound colder, wider and more mechanical.

This less obvious application is worth exploring. A flanger does not always need to sound like a dramatic aeroplane sweep. Low Rate, low Feedback and moderate Depth settings can add subtle movement to arpeggios and chord parts.

ZVEX Vibrophase

The ZVEX Vibrophase Guitar Effect Pedal sits at the experimental end of phase modulation.

Rather than functioning only as a conventional smooth phaser, it combines phase-shifting movement with vibrato-style pitch character and unusual control over the modulation response. It is designed for players who want the effect itself to become part of the performance.

Depending on the settings, it can move from relatively familiar phase textures into warped, uneven and almost unstable modulation.

The Vibrophase is best suited to:

• Experimental guitar.

• Psychedelic textures.

• Noise and ambient music.

• Players who want non-traditional modulation.

• Musicians who interact with pedal controls while performing.

It is more specialised than a basic phaser. A player looking only for one classic slow sweep may not need its wider range, but it offers considerably more personality for adventurous sound design.

EarthQuaker Devices Grand Orbiter V3

The EarthQuaker Devices Grand Orbiter V3 Phaser Pedal is a versatile four-stage analogue phaser based around operational transconductance amplifier, or OTA, circuitry.

Its three-position mode switch provides slow and fast modulation ranges, plus a fixed-filter mode that stops the automatic sweep. In fixed mode, the pedal can be used almost like a resonant tone-shaping filter.

The Grand Orbiter also provides controls for:

• Rate.

• Depth.

• Resonance.

• Sweep range.

This makes it more adjustable than a traditional one-knob phaser.

Lower Resonance and Depth settings produce gentle movement suitable for clean chords. Increasing Resonance makes the phase peaks more noticeable, while the Sweep control determines which area of the guitar’s frequency range receives the strongest movement.

It is a strong option for players who want classic analogue phasing but need more control over where and how the effect moves.

BOSS PH-3 Phase Shifter

The BOSS PH-3 Phase Shifter Guitar Effects Pedal expands the familiar compact phaser format with several stage settings and directional modulation modes.

Its selectable phase stages allow players to move between simpler and more complex sweeps. It also includes Rise and Fall modes, which create continuously ascending or descending movement rather than the normal back-and-forth cycle.

The Step mode produces a more rhythmic, staircase-like modulation.

The PH-3 is particularly useful for:

Guitarists who need several phaser characters from one pedal.

• Modern or experimental modulation.
• Rhythmic clean playing.
• Synth-like guitar textures.
• Players who value the familiar BOSS compact format.

It can cover conventional phasing, but its main advantage is the ability to move beyond vintage-style sounds.

Get phaser pedals at Music Bliss, including the Electro-Harmonix Nano Small Stone, Tone City Summer Orange, Nobels MOD-Mini and JAM Pedals Ripple.

ThorpyFX Camoflange MKII

The ThorpyFX Camoflange Flanger MKII Guitar Effects Pedal is positioned as a premium analogue flanger for players who want detailed control without losing the warmth associated with classic units.

It was developed with Dan Coggins, whose circuit-design history includes highly regarded British analogue effects.

The Camoflange provides extensive control over the sweep and tonal behaviour of the effect. This allows it to cover restrained chorus-like movement, classic tape-inspired flanging and stronger resonant jet sweeps.

A premium analogue flanger becomes especially useful when the player wants to tune the effect around a particular amplifier or distortion sound. The position and intensity of the sweep can be adjusted so that it enhances the guitar rather than masking it.

The Camoflange is suited to:

• Detailed studio work.
• Premium analogue pedalboards.
• Players who use flanging as a core sound.
• Classic rock and progressive guitar.
• Subtle modulation as well as dramatic sweeps.

EarthQuaker Devices Pyramids Stereo Flanging Device

The EarthQuaker Devices Pyramids Stereo Flange Pedal takes a much broader, more programmable approach.

It offers multiple flanging modes, stereo operation, preset storage, tap tempo and extensive control over the modulation shape. Instead of specialising in one vintage flanger sound, it functions as a full flanging workstation.

Its available textures extend from recognisable classic sweeps into:

• Through-zero-style flanging.
• Barber-pole movement.
• Triggered modulation.
• Step-based patterns.
• Dramatic stereo effects.
• Chorus-like widening.
• Resonant experimental sounds.

Preset storage is particularly valuable on stage. A player can save one subtle flanger for clean rhythm parts and another extreme sound for transitions or noise sections.

The Pyramids suits guitarists who want the flanger to perform several roles and who are comfortable working with a deeper control layout.

BOSS BF-3 Flanger

The BOSS BF-3 Flanger Guitar Effects Pedal is a practical modern flanger with several operating modes.

In addition to conventional flanging, it includes Ultra, Gate/Pan and Momentary functions. Gate/Pan can create rhythmic modulation and stereo movement, while Momentary mode activates the effect only while the footswitch is held.

The BF-3 also provides separate guitar and bass inputs, allowing its response to be adapted to either instrument.

It is a strong choice for:

• First-time flanger users.
• Working guitarists who need a durable compact pedal.
• Bassists exploring modulation.
• Players who need both conventional and modern sounds.
• Musicians who want momentary flanger accents.

The control range is wide enough for subtle movement, but the additional modes can also create much more obvious special effects.

Get flanger pedals at Music Bliss, including the Electro-Harmonix Andy Summers Walking on the Moon Flanger/Filter Matrix Pedal.

Where Should a Phaser Go in the Signal Chain?

There is no single mandatory position. The effect changes depending on what appears before and after it.

A conventional placement is:

Guitar → Compressor → Overdrive/Distortion → Phaser → Delay → Reverb → Amplifier

This places the phaser after distortion. The pedal sweeps the full distorted sound, making the modulation clear and easy to hear.

Phaser before distortion

Try:

Guitar → Phaser → Overdrive/Distortion → Amplifier

Here, the distortion reacts to the moving frequencies produced by the phaser.

The result is generally:

• More blended.
• Less obviously “effected.”
• More responsive to picking.
• Similar to several classic rock applications.

• Slightly rougher as the distortion reshapes the sweep.

This position is useful when you want phase movement inside the gain texture rather than floating on top of it.

A subtle phaser before an overdriven amplifier can make rhythm playing feel alive without producing an obvious swoosh.

Phaser after distortion

• Ty:

Guitar → Overdrive/Distortion → Phaser → Amplifier

The phaser now processes the complete distorted signal.

The result is often:

• Deeper.
• Cleaner in its modulation.
• Easier to identify.
• More dramatic on sustained notes.
• More suitable for pronounced psychedelic sweeps.

This position works well when the phaser is intended as a noticeable section effect.

Phaser in an amplifier effects loop

An effects loop places the phaser after the amplifier’s preamp distortion but before the power-amplifier stage.

This can produce a clean and pronounced sweep, especially when the amplifier itself supplies most of the gain.

However, check that the pedal is comfortable with the loop’s signal level. Some loops run hotter than standard guitar-pedal inputs.

Where Should a Flanger Go in the Signal Chain?

A common starting point is:

Guitar → Compressor → Overdrive/Distortion → Flanger → Delay → Reverb → Amplifier

Placing the flanger after distortion creates a strong, recognisable sweep. This is useful for dramatic rock rhythm sounds and obvious jet-plane movement.

Flanger before distortion

Try:

Guitar → Flanger → Distortion → Amplifier

The distortion compresses and reshapes the comb-filtered signal.

This tends to produce:

• A less polished sweep.
• A more integrated sound.
• Additional harmonic complexity.
• Strong interaction with pick attack.
• A vintage or aggressive character.

The effect may be less clear, but it can become part of the distortion rather than sounding like a separate layer.

Flanger after distortion

Try:

Guitar → Distortion → Flanger → Amplifier

This usually creates:

• More obvious movement.
• Stronger metallic resonances.
• A deeper perceived sweep.
• Clearer jet-like sounds.
• Greater control over the final modulation texture.

This is a good position for songs where the flanger must be heard immediately.

Flanger in the effects loop

Placing a flanger in the amplifier’s effects loop can create a broad and studio-like sound because it processes the complete preamp tone.

This is particularly useful with high-gain amplifiers. A flanger placed before a heavily distorted preamp may become blurred, while the loop preserves more of its sweep.

Once again, confirm that the pedal and loop levels are compatible.

Should Modulation Go Before or After Delay?

Most players place phaser and flanger before delay:

Modulation → Delay → Reverb

This causes the delay pedal to repeat the already-modulated sound. Each repeat contains the sweep that was present when the note entered the delay.

Placing modulation after delay creates a different result:

Delay → Phaser or Flanger

Now the modulation processes both the dry note and its repeats together. The entire echo field appears to move as one surface.

This can be useful for:

• Ambient guitar.
• Psychedelic sound design.
• Synth-like textures.
• Dramatic transitions.
• Experimental studio effects.

The result may become less defined, particularly with high feedback settings on both pedals.

Begin with a slow Rate

Fast modulation can immediately sound dramatic, but it may also make chords feel out of tune or distract from the rhythm.

Start with a slow sweep and increase the speed only when the musical part requires it.

Adjust Depth while the band is playing

A setting that sounds subtle alone may become inaudible beside drums and another guitar. A deep setting that sounds exciting alone may take up too much space in the full arrangement.

Set modulation depth in the context where it will be used.

Use feedback carefully on a flanger

Feedback increases resonance and exaggerates the metallic character.

Small adjustments can produce a major difference. High feedback settings may dominate the original guitar tone and create sharp peaks through bright amplifiers.

Reduce modulation for complex chords

Deep phasing and flanging can blur extended chords because different frequencies are continuously being cancelled.

For dense chord voicings, reduce Depth, Feedback or Mix. Save stronger settings for single-note riffs, power chords and sustained notes.

Try a fixed flanger or phaser position

Some pedals allow the modulation sweep to be stopped. This creates a static filtered tone rather than continuous movement.

A fixed setting can produce:

• Hollow rhythm tones.
• Nasal lead sounds.
• Lo-fi textures.
• Filtered funk parts.
• Unusual distortion voices.

It is useful when you like one moment of the sweep but do not want the sound to keep moving.

Listen in mono and stereo

Stereo phasers and flangers can sound enormous through two amplifiers, studio monitors or a stereo PA.

However, not every venue or recording will remain fully stereo. Check that the effect still works when summed to mono, particularly when using extreme width or phase settings.

Which Effect Should You Choose?

Choose a phaser when you want:

• Smooth and rounded movement.
• Psychedelic rhythm tones.
• A Uni-Vibe-adjacent pulse.
• Subtle animation under distortion.
• A vocal or liquid quality.
• Movement that remains blended with the guitar.

Choose a flanger when you want:

• A more dramatic sweep.
• Jet-plane and metallic sounds.
• Chorus-like width at restrained settings.
• Strong movement on distorted riffs.
• Experimental comb-filter textures.
• Rhythmic or stereo modulation.

Choose both when their roles are different.

A slow phaser can remain on for an entire clean section, while a flanger can be activated for one riff, transition or dramatic accent.