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Compact silver metal vocal pedal with footswitch and four control knobs on top

TC

TC Electronic Helicon Critical Mass Vocal Effect Pedal

SKU CH-59CJ-V8FBE

Creates choir-like gang vocals or melodic harmonies from a single voice with style, mix, reverb and tone controls

  • Creates rich gang-vocal textures with four style choices
  • Adds melodic harmonies in unison and octaves without key input
  • Balanced XLR I/O keeps signal clean on stage
  • Ultra-low noise floor exceeds 114 dB for pristine vocals
  • Rugged die-cast metal housing withstands touring demands

Vocal Harmony Pedal for Live Singers

The TC Helicon Critical Mass is a compact effects pedal built for vocalists who want instant gang-vocal textures on stage. It generates unison, octave-up, octave-down and combined octave layers without needing a key or scale input. A single footswitch engages or bypasses the effect, while Style, Mix, Reverb and Tone knobs shape the sound. Balanced XLR input and output connect directly to a PA or mixer.

Singers Who Need Simple Crowd Layers

This unit suits performers who want choir-style backing without programming harmonies or plugging in an instrument to drive pitch detection. It does not offer interval selection beyond the fixed unison and octave options, so singers needing thirds, fifths or custom scales should look elsewhere. The pedal also lacks a guitar trigger input, MIDI control or preset storage, limiting its use in complex rigs.

Fixed Unison and Octave Harmony Engine

The defining specification is the harmony engine itself: four Style settings locked to unison, octave up, octave down and both octaves together, with no user-defined intervals or key entry. That constraint decides whether the Critical Mass fits a set list built around simple crowd choruses or whether a more flexible harmony processor is required.

Highlights

  • Creates rich gang-vocal textures with four style choices
  • Adds melodic harmonies in unison and octaves without key input
  • Balanced XLR I/O keeps signal clean on stage
  • Ultra-low noise floor exceeds 114 dB for pristine vocals
  • Rugged die-cast metal housing withstands touring demands

Specifications

No published specifications for this item yet.

Questions about this item

How do I choose between the four gang-vocal styles and the four melodic settings on the Style knob?

The Style knob selects four gang-vocal modes — unison, octave up, octave down, and octave up/down combined — plus four matching melodic modes that track your pitch without needing a key or scale input.

What does the 114 dB signal-to-noise ratio mean for my live vocal chain?

An A-weighted SNR above 114 dB keeps the added harmonies virtually silent when you stop singing, so stage noise stays low even at high gain.

Will the XLR output’s 200 Ohm impedance work with my mixer’s mic preamp?

Yes, the 200 Ohm balanced XLR output is designed to drive standard mic-level inputs cleanly, with a full-scale level of +7.5 dBu.

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