The DL4 MkII includes everything in the original DL4 Delay Modeler, while introducing 15 new MkII delays drawn from our HX family of amp and effects processors and both 4-Switch and 1-Switch loopers with up to 240 seconds of record time (expandable to several hours using an optional microSD card). There's also an XLR microphone input, MIDI In and Out/Thru connectors, heavy duty footswitches, three bypass options, and a jack for connecting an optional expression pedal or two additional footswitches. The DL4 MkII is also smaller and lighter than the original, making it an even more appealing choice for modern musicians.