The Dunlop MXR M169 Carbon Copy analog delay pedal creates rich, warm bucket-bridgade delay for up to 600 milliseconds. Three knobs each control delay, mix and regen to make layered sounds as if you're playing two instruments in one. The two internal trim pots let you adjust the width and rate control of whatever modulation you desire through an all-analog audio path that delivers pure sound from your guitar to the amp.