Born to Revolve. There is something uniquely powerful about the sound of a vintage rotary speaker system. The organic chorusing as the treble horn and bass rotor start speeding up. The grit of the internal tube-driven amplifier, creating additional harmonics that spin around the room. Plug into Lex, close your eyes, and be transported by this classic sound, recreated with astonishing realism and depth for your pedalboard. The Complete Rotary Speaker System. Lex provides you with a complete, accurately reproduced rotary speaker system: the low-frequency bass rotor, the rotating treble horn, the tube-driven amplifier, finely tuned microphone placement, and all the complex sonic interactions between these elements. Powerful, intuitive controls mean you can quickly dial in just the customized sound you desire. Classic Sound, New Features. Our second generation Lex gives you the same rich rotary sounds of our original and adds significant new features, incorporating technological advancements, hardware improvements and design enhancements to give you additional flexibility, power, and ease of use on stage and in the studio.