Check the listing for details. T-Rex Engineering Betavibe Chorus Rotary Simulator Beta Vibe Guitar Effect Pedal. Condition: Used. Listed at 235.00 USD. The T-Rex BetaVibe is an analog Rotary speaker simulator & chorus pedal loaded with features. Unlike the other chorus units, the BetaVibe's mix knob allows the user to dial in a very subtle chorus, an all out psychedelic swirl, or anything in between. This analog pedal from T-Rex Engineering is designed to deliver a unique sound that will add warmth and depth to your performance. With its intuitive controls, you can easily adjust the modulation rate, depth, and mix to create the perfect sound for your music. The Betavibe Chorus Rotary Simulator is made to last with a sturdy construction that can withstand the rigors of touring and recording. It's perfect for any musician who wants to add a touch of classic chorus and rotary speaker effects to their sound without sacrificing quality. T-Rex pedals are handcrafted in Denmark