Warm Audio C1 Mod Small Format Chorus / Vibrato Pedal

The all-analog circuit inside this compact enclosure is a direct recreation of the most celebrated chorus and vibrato pedal in guitar history, now with separated depth and rate controls and a fully bypassable preamp. Warm Audio's WA-C1 Mod delivers the lush midrange character of genuine Bucket Brigade Device modulation through a premium MN3007 BBD chip paired with five ICs (including three Texas Instruments audio op amps), eleven discrete transistors, three FETs, and nineteen diodes. Top-mounted jacks and a footprint of just 2.8" wide by 4.5" long make it a pedalboard-friendly alternative to the larger original, while the dual DC-DC voltage converter maintains vintage-correct internal operation from a standard 9V supply drawing 200mA.

The analog preamp section can now be switched between vintage mode (always engaged, adding bite and natural compression) and modern mode (bypassed for precise gain-staging in complex rigs). Selectable input impedance on the rear panel offers 50k ohm for vintage-accurate response or 1.1M Hi-Z for passive string instruments, maintaining clarity even in bypass. Separate depth and rate controls for the chorus setting expand beyond the fixed-depth intensity control of the original, allowing subtle shimmer or full-bodied swirl across a wider palette of rates. Output level sits at 315mV with wet/dry stereo capability, while input sensitivity switches between 80mV and 10mV to accommodate line-level sources or high-output pickups.

The vibrato mode delivers rotary-like wobble suited to funk, fusion, and jazz applications, with a front-panel LED flashing in time with the modulation rate. Hand-tested in Austin, Texas, this pedal works equally well in front of mid-gain amps for grunge textures, ultra-clean setups for 80s new-wave tones, or dual-amp rigs where the stereo outputs create wide, spacious modulation across the stage. Weight comes in at 1lb with a height of 2.4 inches, fitting standard pedalboard risers without obstruction.

Features

• 100% analog chorus and vibrato with MN3007 BBD chip recreation
• Bypassable preamp via vintage/modern switch for flexible gain-staging options
• Separate depth and rate controls for chorus, expanding beyond vintage limitations
• Selectable input impedance: 50k ohm vintage or 1.1M Hi-Z for passive instruments
• Stereo wet/dry outputs at 315mV with single mono input configuration
• Dual DC-DC voltage converter for vintage-correct operation from 9V supply
• Compact enclosure: 2.8" wide, 4.5" long, 2.4" tall, 1lb weight
• Hand-tested in Austin, Texas with five-year warranty coverage included