The Radius is a ring modulator and frequency shifter with pitch tracking and an advanced LFO. It is designed around a novel "eight-quadrant multiplier" algorithm that smoothly transitions from ring modulation to frequency shifting and allows different frequency ratios for the upper and lower tones. Radius puts complex harmonic structures, bell-like tones, metallic textures, frequency shifting, soft tremolo, and bubbly phaser sounds at your fingertips.

A ring modulator multiplies two signals together to create new frequencies that are the sum and difference of the input frequencies. One signal is your instrument, and the other is an internal oscillator. The Radius can double the sum or difference frequency ratios and adjust their relative levels, unlocking a spectrum of timbres beyond traditional ring modulation.

Pitch tracking, a push-to-tune footswitch, and picking dynamics make the Radius responsive and predictable on stage. Hold the left footswitch and play a note to tune the carrier oscillator to that note. Pitch tracking maintains the pitch ratio as you play up and down the scale, or tracks by a ratio (or inverse) for more dynamic sounds. An expression pedal can be assigned to any combination of knobs.