Warm Audio WA-C1 Mod Chorus Vibrato

A Classic of Analog Modulation, Reimagined for Today

The WA-C1 Mod Chorus Vibrato follows in the footsteps of the very first analog chorus/vibrato pedals that shaped the sound of the '70s and '80s: a wide, slightly "liquid" modulation with the characteristic movement of BBD delay line circuits. This type of pedal has become a reference both for thickening a clean tone and for adding width to a light crunch, with a very musical feel in the midrange.
Where this reinterpretation goes further is in flexibility: the preamp (often at the heart of the personality of these vintage designs) can be activated or bypassed via the "vintage/modern" mode. This way, you retain the original spirit while gaining real room to adapt the pedal to your guitar, amp, and the rest of your pedalboard.

Who Is the WA-C1 Mod Made For and What Styles?

This pedal is aimed both at guitarists seeking their reference analog chorus and at already-equipped musicians looking for a more "alive" chorus/vibrato than a digital modulation. Its very responsive behavior makes it enjoyable for playing nuances: it follows your touch, pick attacks, and right-hand dynamics without sounding like a slapped-on effect.
In terms of styles, it excels in pop, rock, blues, funk, and new wave for wide, shimmering cleans, but it also finds its place in ambient and indie when pushing the depth for undulating soundscapes. The vibrato is perfect for more expressive textures, reminiscent of tape or "pitch wobble," both in studio and live settings.
Thanks to the Hi-Z and input sensitivity selector, the WA-C1 Mod is not limited to guitar: it can process a bass (wide but clear chorus) or a keyboard (wide stereo without loss of clarity), making it a very versatile modulation tool in a modern setup.

Controls, Modes, and Ergonomics: Designed to Sculpt Your Modulation

The WA-C1 Mod offers a very "studio" approach to adjustment, with dedicated controls for each effect. You have a input sensitivity selector (Hi/Low) and an input level to adapt the headroom and circuit response depending on your pickups, upstream pedals, or instrument. Then, the chorus benefits from its depth and rate (speed) controls, and the vibrato also has its own depth and rate settings, handy for switching from a subtle chorus to a more pronounced vibrato without reconfiguring everything.
At the rear, the Hi-Z selector helps maintain the expected tonal balance depending on the source (guitar, bass, keyboard). The Bypass mode switch: vintage/modern allows you to bypass the preamp section: in practice, this is an excellent way to adjust the amount of character and attack feel, especially if you often change amps or want a more neutral integration in an already colored chain.
The dual-function footswitch is designed for the stage: one press toggles On/Off, and a hold switches between chorus and vibrato. Ideal for moving from a widened clean to a more "expressive" modulation on a verse or break, without having to dance on the pedalboard.

The Sound

The WA-C1 Mod's character is decidedly analog: a smooth, three-dimensional modulation with beautiful midrange density and a very organic sense of movement. In chorus mode, expect a rich stereo widening, capable of ranging from a light "shimmer" that enhances an arpeggio to thicker textures that make chords and double-stops stand out.
The vibrato offers a more direct pitch modulation, ideal for retro sounds, expressive melodic lines, and slightly unstable atmospheres, while remaining musical. When engaged, the preamp can add coloration and responsiveness that make the effect feel like an integral part of the amp rather than a simple add-on at the end of the chain; bypassing it gives you a more neutral response, perfect for preserving the identity of your guitar or other pedals.

Technical specifications

Effects	Chorus, Effects	Type	sector
Technology	Analog	Use	electric guitar
Format	Pedal	Color	Grey

Input sensitivity selector	Hi/Low	Input sensitivity	80 mV / 10 mV
Chorus	depth and rate	Output level	315 mV
Vibrato	depth and rate	Dimensions	115 x 70 x 60 mm
Bypass mode	vintage / modern (preamp section bypass)	Weight	500 g
Dual-function footswitch	On/Off and chorus/vibrato toggle on hold