Check the listing for details. Used MXR M291 Dyna Comp Mini Compressor Guitar Effects Pedal. Condition: Used. Listed at 89.99 USD. Used MXR M291 Dyna Comp Mini Guitar Effects Pedal!Mint, with all original packaging! Orders placed before 12:00 PM Eastern Standard Time will ship same day! Orders placed after 12:00 will often ship same day as well, if not, they will ship next day.International orders: Please note that you will be responsible for any applicable customs fees or import taxes!Check my feedback and bid with confidence! The Dyna Comp Mini Compressor combines the best of classic tone and modern convenience in a housing that's nearly half the size of the original. Thanks to its rare CA3080 "metal can" integrated circuit (IC), this pedal yields quieter operation, greater transparency, and increased dynamic range. An all-new Attack switch toggles between slow and fast attack times.