It worked. Then it kept working on instruments it was never designed for. By the time pop music caught up, the rotating speaker had been used on jazz organ, gospel piano, psychedelic guitar, soul horns, prog rock vocals, and a Beatle pretending to be the Dalai Lama.
Rotary SD-147 puts that cabinet on a track in your DAW. Mono or stereo. Mac or Windows. No 150-pound box. No cracked capacitors. No relay clicks.
Intro Price: $49 (orig $99) for a limited time
Two rotors, modeled top to bottom
A rotating horn for the mids and highs. A rotating drum for the lows. Independent gain on each so you can find the balance you want: bright and singing, warm and round, or something the original cabinet was never quite capable of. Acceleration and deceleration are modeled per rotor, matching the real cabinet. The lighter horn ramps up before the heavier drum catches up.
Three speeds. Played, not just set.
Slow (Chorale). Stop. Fast (Tremolo). The toggle is the heart of the instrument, and it was always meant to be played live. Map it to a MIDI controller or a keyswitch and you’ll trigger the spin-up and spin-down in real time, the way the cabinet was used on stage. Or automate it in your DAW so the transitions land on the beat. The Accel and Decel knobs decide how fast the rotors get there: clockwise for snap, backed off for long woozy ramps. Tempo Sync locks the rotation to your project tempo for musical time. (And if you want to decide where the rotors stop, Brake to Position handles that. More on it in the next block.)
Beyond physics
Mechanical noise from “real and noisy” to “completely silent.” Mic bleed on (the natural recording behavior) or off (impossible on the original device, since each rotor was always picking up sound from the other). Brake to Position stops the horn and drum at any angle you specify, fully automatable. Pin the sound to an exact spot in the stereo field on a precise beat. The original cabinet could do none of this. We built it because you should be able to.
Use Cases
Organ
Still the home base. Drop it on an organ track, hit the speed switch, and the part finds itself.
Guitars
Sustained chords, lead lines, arpeggios. The cabinet is part of the rock canon for a reason. Harrison and Clapton ran their guitars through it. So did Hendrix, Gilmour, and Buddy Guy. Next time you want a clean lead to feel less like a clean lead, this is what you reach for.
Synths and pads
A synth pad through a rotating speaker stops sounding synthetic. The Doppler-and-tremolo combination is the closest thing in audio to actual air motion.
Vocals
Backgrounds, lead doubles, dream sequences. If you want a vocal to sit in space rather than in front of the speakers, this is one of the oldest ways to put it there.
Lo-fi production
The pitch instability of a real rotating speaker is most of what lo-fi producers chase with broken tape emulations. Crank the noise level, dial back the depth, throw it on a Wurli or a sampled chord, and listen to the bottom drop out of the room. The mechanical noise alone can stand in for vinyl crackle.
What audio professionals say about Rotary SD-147
“I love Slate’s new Leslie Simulator. It’s incredibly expressive and flexible, and it faithfully recreates the sound of a classic instrument. It has become a fantastic new top addition to my modulation arsenal.”
David Bottrill
3 TIME GRAMMY AWARD WINNING PRODUCER & MIXER
“I love Slate’s new Leslie Simulator. It’s incredibly expressive and flexible, and it faithfully recreates the sound of a classic instrument. It has become a fantastic new top addition to my modulation arsenal.”
David Bottrill
3 TIME GRAMMY AWARD WINNING PRODUCER & MIXER
System Requirements
macOS
| Category | Details |
|---|---|
| Minimum OS* | macOS 10.15 Catalina - 13 Ventura |
| Supported OS | macOS 14 Sonoma or later |
| Processor / RAM | Intel or Apple Silicon, 4GB RAM |
| Plugin Formats | AU, VST, VST3, AAX (64-bit host) |
Windows
| Category | Details |
|---|---|
| Minimum OS* | Windows 10 |
| Supported OS | Windows 11 |
| Processor / RAM | Intel or AMD processor, 4GB RAM |
| Plugin Formats | VST, VST3, AAX (64-bit host) |
iLok Requirements
- Complete Access licenses have two activations and can be activated on iLok Cloud, an iLok 2 & 3 dongle, or your local host computer (Machine-ID).
- Individual plugin licenses can be activated on an iLok 2 & 3 dongle or your local host computer (Machine-ID).
*NOTE: We do not actively test these older operating systems as they are no longer supported by their respective developers, but we currently know of no reasons the current versions of our plug-ins will not work on these systems. That said, your mileage may vary. If you need access to older versions of our products, please contact either Slate Digital Support or check the SSL/Harrison Legacy Plugins Download list.
Access It Your Way
Available as a standalone purchase or included in Complete Access. Already a subscriber? It’s in your account on launch day.
Intro Price: $49 (orig $99) for a limited time
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