Description
Rotary speaker tone has been chased by guitarists since the Beatles and Jeff Beck first bolted a Leslie into their rigs, and the Boss RT-20 puts that swirling, breathing character right at your feet. Built on Roland’s COSM modeling, it reconstructs the interaction between a virtual horn and bass rotor with genuine nuance — not just a wobbly chorus imitation, but a convincing sense of physical rotation, speed transition, and tonal blend.
- COSM-modeled rotary tones with adjustable Rise Time for gradual or snappy slow/fast transitions
- Independent Treble Rotor and Bass Rotor balance control
- Onboard Overdrive for pushing the rotary sound into grittier, rock-oriented territory
- 4 selectable sound types, including UNI-V-style modulation alongside classic rotary voicing
- Guitar/Keyboard Drive Type switch to tailor response to your instrument
- Dual outputs for true stereo spread across your rig or amps
- Illuminated Virtual Rotor display — red center for the horn, blue outer ring for the bass speaker — tracking rotation speed in real time
- Expression pedal input (EV-5, sold separately) for hands-free control over rotation speed
Drop it into your chain as a modulation centerpiece rather than a subtle texture — the RT-20 wants to be heard and seen, with a display that turns your board into a small light show while it works. It runs on six AA batteries or an optional PSA-series adaptor, includes a headphone jack for quiet practice, and accepts both mono and stereo input/output configurations depending on how you want to route it.
Whether you’re chasing Santana’s singing sustain, Stevie Ray’s touch of swirl, or something entirely your own with the pulsating overdrive mode, the RT-20 gives pedalboard builders a rotary voice that’s flexible enough to sit anywhere from a clean platform to a saturated lead tone.
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