Fairfield Circuitry Shallow Water vs Walrus Audio Polychrome

Aug 19, 2026

Shallow Water vs Polychrome sets two very differently shaped modulation pedals next to each other: one built on randomness from the ground up, the other a flanger that keeps randomness as one option among three. The widget above plays both through the same loop, the same chain and the same room at three settings (Lush, Wild and Special), so you can hear where they overlap and where they don’t before reading a word about it.

Fairfield Circuitry Shallow Water

Fairfield calls the circuit a K-field modulator, and that name is doing real work. The usual chorus and vibrato recipe, a bucket brigade delay line modulated to shift pitch and blended back with the dry signal, is all here, except a pseudo-random generator drives it instead of a repeating waveform. The delay time wanders in random steps rather than sweeping predictably, which is where the unsettled, seasick character comes from.

The panel reads Rate and LPG on top, Damp and Mix in the middle, Depth and Volume at the bottom. Rate sets how often those random fluctuations happen and Depth how intense they are, while Damp shapes their slope: at minimum the steps are quick and sudden, wound up they slow right down. Mix decides the flavor, full wet leaning vibrato, more dry pulling it toward chorus. LPG is the odd one out. It feeds the recovery filter’s envelope, so picking harder brightens the tone and playing softer darkens it and chokes the sustain.

The three settings land in different corners of that grid. Wild drops Damp to zero and pushes Rate and LPG up with the Mix half dry; Special keeps those fast, sudden steps but goes mostly wet with more Depth. There’s a lot more of it in the full Shallow Water demo.

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Walrus Audio Polychrome

The Polychrome is an all-analog BBD flanger, and three design choices are what lift it past the usual one-trick version of that effect. Feedback adds regeneration, which is where the metallic, jet-plane intensity lives. Sweep sets the center frequency of the notch filter, so you choose where in the range the effect sits. And the D-F-V knob blends from fully dry at minimum, through traditional flanger, all the way to pitch vibrato at maximum.

Two small toggles sit between the knobs. Shape cycles through sine, triangle and random modulation: the difference between sine and triangle is subtle, but random is clearly something else, and it’s my favorite thing about the pedal. It makes everything sound more natural, as if the signal is going through some magic liquid. Voice switches between a traditional full-frequency flange and a complex notched flange with reduced low end.

I tuned the Lush setting deliberately toward a chorus sound here, with Feedback low and the D-F-V near the middle. Wild cranks Feedback all the way up and pushes the blend further toward vibrato, and Special is the one running the random Shape. The full Polychrome demo covers sweeps for Sweep, Feedback, D-F-V and both switches.

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Get This One If…

Get the Shallow Water if you’re chasing lo-fi, ambient or nostalgic texture rather than a repeatable effect setting. The randomization is the whole point, and the LPG makes the pedal respond to how hard you pick, which is not something a flanger does. This is the one for the swampy, degraded, old-tape end of modulation, and the one that gets bandmates turning their heads mid-practice. If you need a chorus that sounds identical every time, that’s a real limitation.

Get the Polychrome if you want the full flanger toolkit with chorus and vibrato included. Psychedelic space rock and shoegaze are its home ground, and between cranked Feedback, the parked filter trick with Depth at zero and the random Shape it reaches well past classic jet sweeps. It’s also the more practical single-box answer if you want one modulation pedal covering three recognizable effects.