Check the listing for details. MXR DYNA COMPRESSOR. Condition: New. Listed at 170.75 USD. The MXR Dyna Comp is a compressor where you can easily adjust the maximum volume and the sensitivity of when the circuit becomes active as you wish. With this unique effects device you can set exactly that incomparably percussive, #clicking# undistorted electric guitar sound that you have already heard on countless pop music hits. You can also use it to perfectly adjust the volume of ending notes in gentle solos. Controller: Footswitch switches the effect on or off. off (bypass). Red LED indicates activated effect. The #Output# knob controls the compressed (adjusted) volume. The #Sensitivity# knob controls the compression rate (highest sensitivity means maximum compression). All of our items have a 30-day return policy without explanation. Sheet music, reading material and software c.