Ours is a frantically paced world. So, I quite like instruments and effects that slow my roll. Delays, reverb, and tremolo all do the trick nicely. But rotary-speaker-type effects can be every bit as good at slowing frantic, frenzied picking to a molasses pace.
Whether a rotary-style pedal “spins” at a slow rate or a fast one … it’s all a lullaby to me. To truly distort time and have a decelerative influence, though, a rotary effect must create a real sense of depth. Boss’ RT-2 Rotary Ensemble possesses this kind of dimensionality in abundance. It’s syrupy and complex. And while it lacks some of the features that distinguish more embellished, contemporary rotary, vibrato, or Uni-Vibe-style pedals, the Boss’ smartly streamlined controls deliver subdued or in-your-face modulations in many shades, with functionality that doesn’t distract.
Ode to Rotation
Though the RT-2 is, in many respects, a more compact riff on the Boss’ RT-20, which was discontinued in 2019, it isn’t as simple as it looks from five paces. The two knobs on the pedal’s face are actually four controls made up of two concentrically stacked dials. Two of the knobs set the speeds you move between when you press and hold the soft-latch pedal. The other two set the effect output level (which is handy for backgrounding or foregrounding the effect) and a drive circuit that approximates tube amp drive in a real rotary speaker. The drive control, though, can also be repurposed as a balance between virtual bass and treble “horns” when you slide a switch on the pedal’s crown. A second switch on the crown selects fast and slow ramp times between two rotary speeds.
A third “mode” switch moves between three distinct effect voicings. The first, in Boss’s description, approximates the frequency response of a Leslie 122. To my ear it is the most open and neutral of the three. Mode II is described as having a wider tonal range more suited to drive and distortion. It’s much more focused in the midrange and slices like a machete when paired with a gain device or overdriven amp. Mode III is flat-out dirty, and while it sounds cool with distortion, it’s useful for achieving radical tone shifts in rigs with fewer effects. A lot of Hendrix and Gilmour fans will spend time here. The footswitch, in addition to functioning as the bypass, and the ramp switch can be reconfigured in different ways. Most notably, it can be used to activate the slowest rate of rotation first, or vice versa.
Sundae Swirl
Though some expensive, dedicated rotary speaker simulators may be better at achieving the mechanically derived, microtonal nuances of a real Leslie or Fender Vibratone, the RT-2 nails the mood and basic richness of the genuine article. The modulation pulses are distinctly hazy around the edges in a way a Uni-Vibe pedal or standard vibrato is not. At the slowest rates, these modulations can serve as a simple thickening agent in a fashion that almost mimics light boost or compression, particularly when the effect level is set to conservative zones. Faster modulations are more overtly rotary-like. Pitch shifts are less binary and bouncy and instead seem to melt into one another. And in a recorded mix with an appropriate sense of room ambience, you’d probably be hard-pressed to discern the RT-2 from a real Leslie.
Though the drive control is effective for adding attitude and color to modulations, I derived a lot more utility and fun from using the control in its balance capacity. The ability to mix the virtual high and bass horns—effectively mimicking the microphone placement and mix emphasis when recording the treble and bass horns on a real Leslie—enables surgical placement of the effect in a mix. But it also helps summon the RT-2’s most natural and realistic rotary tones, and it’s the control I tinkered with most when exploring the pedal’s range.
Accurately simulating a real rotary speaker remains one of the trickier feats in pedal design. Not coincidentally, the best simulators are pretty pricey. And while the RT-2’s $239 price tag can give pause, the pedal’s combination of no-fuss functionality, compact size, and often very delicious, convincing, and ecstatically elastic and animated approximations of a mechanical Leslie make crossing the $200 threshold a much more palatable proposition. And I’d venture that once you are fully immersed in the RT-2’s textures, and the surprisingly numerous, even unconventional, ways they can be applied, this well-executed pedal will pay back the investment many times over.
