Chorus, phaser, and flanger all make one guitar sound like more than one guitar. They do it in three different ways, and the records you already love picked a side. Chorus is a second player, slightly late and slightly out of tune, so a chord gets wider. Phaser is a moving notch, so the chord swirls. Flanger is a much shorter delay swept against itself, so the chord jets. If you can hear which one the song is asking for, you stop buying the wrong box.
Shop the three families on their own pages: chorus pedals, phaser pedals, and flanger pedals. This guide is the difference. Those pages are the pedals.
The Short Version
- Chorus: a copy of your note, delayed a little and detuned a little. Width, 12-string shimmer, 80s sparkle.
- Phaser: the same note, with a notch swept through it. Swirl, vibe, the orange-box whoosh on a lead.
- Flanger: a much shorter copy, swept so the notches stack into a jet. Metallic, hollow, through-zero when it turns inside out.
Slow chorus and slow phaser can fool you on a clean chord. Turn the rate up. Chorus gets seasick and watery. Phaser gets rotary. Flanger gets a plane.
What a Chorus Pedal Does
Chorus takes your guitar, delays that copy by roughly 15 to 30 milliseconds, shifts the pitch a few cents, and mixes it back with the dry note. Your ear hears two players who are almost together. On a clean chord that is the 12-string trick: wider, softer on the edges, pretty. On a driven chord it can turn to mush, which is why a lot of players put chorus after dirt and keep the mix low, or leave it for the clean channel only.
Analog bucket-brigade chorus is the warm, slightly wobbly one. Stereo chorus puts the copies in opposite speakers so the room opens up. Vibrato is the same circuit with the dry signal pulled out, so the pitch itself moves. Uni-Vibe sits next door: more of a throb than a shimmer, the rotary cousin people file under chorus because the pedal often says chorus/vibrato on the face.
Start with the Walrus Julianna if you want stereo analog chorus and vibrato that makes a chord breathe. The Julia V2 is that same family in a smaller box. The EarthQuaker Aurelius gives you three chorus voices when one detuned copy is not enough. The MXR Uni-Vibe is the throb. The whole wall is on the chorus pedals page.
What a Phaser Pedal Does
A phaser does not add a late copy you can hear as a slap. It splits the signal, shifts the phase of one side, and sweeps the frequency where those two sides cancel. That moving cancellation is the swirl. Two stages are subtle, a coloration you can leave on. Four stages are the classic orange-box sweep, the one under a solo that feels like the note is turning. Six stages and harmonic voices go further into vibe and, on some boxes, into flanging.
Speed is the whole performance. Slow is weather under a chord. Noon is the rock sweep. Fast is faux-Leslie. Script or feedback, when a pedal has it, is the difference between a polite vintage swirl and a swoosh with a little hair on the peaks.
The Strymon Zelzah is the dedicated phaser with vintage and harmonic voices, and it is also the box that leans into real flanging. The MXR Phase 90 is the orange box people mean when they say phaser. The Walrus Mako M1 keeps phaser, chorus, tremolo, and rotary in one brain if you do not want three pedals. More of that family is on the phaser pedals page.
What a Flanger Pedal Does
Flanger is chorus’s sharper sibling. The delayed copy is much shorter, a handful of milliseconds, and that delay time is swept. The cancellations stack into a comb filter. Slow, a jet taxis under the chord. Faster, the sound goes metallic and hollow. Through-zero flanging is the studio trick of two tape machines passing through each other: the note seems to flip inside out for a moment.
Phaser notches swirl and stay musical. Flanger notches jet and can get harsh if you leave the mix wide open on a high-gain riff. Use it like a spice. A clean arpeggio, a filtered funk part, a chorus that should sound like an airplane instead of a 12-string.
On this site the flange voice that is actually worth reaching for is the Zelzah. It lives on the flanger pedals page because its 4-stage and 6-stage phasing moves into vibrato, chorus, and flanging without a second pedal. If you want swirl without the jet, stay on the phaser page. If you want doubling more than a plane, stay on chorus.
Which One the Song Wants
- Clean chords that should sound expensive and wide: chorus. Julianna or Julia V2.
- A solo that should turn in the air: phaser. Phase 90 for the classic sweep, Zelzah if you also want vibe and flange in the same box.
- A riff that should sound like a jet or a comb filter: flanger, which here means Zelzah’s flange voice, not a second phaser.
- You only have one slot: the Mako M1 covers chorus and phaser (plus tremolo and rotary). It does not replace a dedicated flanger. Zelzah covers phaser and the flange voice together.
You do not need all three on the board. A lot of players live on one chorus and one phaser, and they visit flanger when the song asks for the plane. Pick the motion first. Then pick the pedal.
Browse chorus, phaser, and flanger, and take the one that sounds like the record in your head.