Classic Rotary Sounds with Authentic Tube Warmth and Realistic Rotor Control

Nembrini Audio proudly announces the release of the Hughes & Kettner Tube Rotosphere Plugin, a faithful digital recreation of the legendary Hughes & Kettner Tube Rotosphere MKII Rotary Speaker simulator. Designed for musicians and producers who crave the lush, tube-driven rotary sound of the original hardware, this new plugin captures every nuance of the iconic effect in a modern, studio-ready format.

Hughes & Kettner Tube Rotosphere Plugin

Originally inspired by the Leslie Speaker System, developed in the 1930s for the Hammond Organ and later made famous by artists like The Beatles, Eric Clapton, and David Gilmour, the Tube Rotosphere became a 1990s classic for its ability to reproduce that same swirling, three-dimensional tone in pedal form. Now, more than three decades later, Nembrini Audio has revived this celebrated sound using advanced digital modelling that faithfully recreates the analogue warmth and musical movement of the original unit.

The Hughes & Kettner Tube Rotosphere Plugin delivers everything from subtle rotary shimmer to deep, cinematic motion, complete with the smooth tube saturation that made the hardware a staple for both guitarists and keyboardists. Whether used in a DAW, live setup, or hybrid studio rig, this plugin offers effortless integration and rich, dimensional tone.

Key Features

Hughes & Kettner Tube Rotosphere Plugin
  • Authentic Analog Emulation: Meticulous recreation of the original circuitry and tube preamp behavior.
  • Independent Rotor Control: Separate LF (low-frequency) and HF (high-frequency) rotor speed settings for precise customization.
  • Realistic Breaker Switch: Simulates ramp-up, slow-down, and full stop effects for lifelike rotary performance.
  • Tube Saturation Modeling: Adds dynamic warmth with real-time visual feedback.
  • Rotor Balance Control: Fine-tune the blend between low and high rotors for perfect tonal balance.
  • Stereo Signal Path: Delivers spacious, immersive modulation with true rotary movement.

Nembrini’s design preserves the organic, evolving motion of the original pedal while adding the reliability and flexibility of a modern digital workflow. The result is a plugin that feels as alive and expressive as the real thing.

Pricing and Availability
The Hughes & Kettner Tube Rotosphere Plugin is available now for desktop at an introductory price of $29.99 (regularly $99) until October 31, 2025.

To learn more or download the plugin, visit www.nembriniaudio.com