TransAcoustic Yamaha LLTA GuitarActuator An actuator installed on the inner surface of the guitar back resonates in response to the vibrations of the strings. The vibrations generated by the actuator are then transmitted to the body of the guitar and to the air in and around it, resulting in authentic reverb and chorus sounds that actually radiate from within the body. Simple Controls Three simple controls adjust the effects levels and line out volume level. The small knobs occupy