For sale is a Boss RT-20 Rotary Ensemble in the original twin-pedal version featuring two integrated footswitches (Effect On/Off & Slow/Fast).

This early version offers more direct control and switching options than the later revision with only one footswitch, making it especially intuitive and practical for live performance.

The RT-20 is widely regarded as one of the most transparent-sounding rotary speaker simulators on the market and is equally popular among keyboardists, guitarists, and synthesizer players.

Historically Inspired Rotary Sound

In the appropriate Drive mode, the RT-20 combines the rotating speaker effect with a driven amp signal, inspired by classic rock organ setups. This concept is reminiscent of the famous rig used by Jon Lord of Deep Purple, who ran his Hammond organ simultaneously through Leslie cabinets and Marshall amplifiers.

Alternatively, the effect can be used purely as a rotary speaker simulation without any amp or drive coloration, delivering authentic chorale and tremolo sounds as well as aggressive rock textures.

One of the RT-20's strongest qualities is the clarity with which both the horn and bass rotor can be heard, whether in slow or fast mode.

This transparency and definition make the RT-20, in our opinion, one of the most musical rotary pedals ever produced, even when compared with much newer models.

Advantages of This Original Version

• Two dedicated footswitches for instant access
• Separate control of effect activation and speed switching (Slow/Fast)
• No menus or button combinations required – one knob, one function
• Ideal for both stage and studio use
• Can be powered by batteries

Features

• COSM rotary speaker simulation
• Separate bass and horn sections with independent speed control
• Adjustable rise/fall time
• Drive control
• Independently adjustable direct and effect signals
• Stereo In / Stereo Out
• Visual rotor display
• Rugged twin-pedal enclosure

Condition & Included Accessories

• Excellent condition; signs of use are only visible upon very close inspection
• Fully functional and technically flawless
• Includes original Boss PSA power supply (approximate value: €32)

Shipping & Payment

• Free insured shipping within the EU
• Securely and carefully packaged
• 14-day money-back guarantee
• 1-year warranty