The DL4 MkII features a simple Single-Switch looper in addition to a classic 4-Switch looper, both of which provide up to 240 seconds of recording time. By inserting an optional microSD card into the slot on the rear of the pedal, recording time may be extended up to several hours and a loop may be stored across power cycles. The loopers operate in either mono or stereo, and may be positioned in the signal chain before or after other effects.

Onboard MIDI In and Out/Thru DIN connectors enable the DL4 MkII to receive continuous controller, program change, and other MIDI messages from external sources such as MIDI controllers, thus allowing parameters to be modified dynamically and presets to be selected remotely. The DL4 MkII provides access to three presets using the A, B, and C footswitches, or six if the Tap switch is set to toggle between two banks of presets (A,B, C and D, E, F). But the DL4 MkII can store up to 128 presets, selectable via MIDI.

Fans of the original DL4 delay pedal will find all of their favourite sounds exactly where they expect them to be, with the same Tweak and Tweez control parameter assignments they've become accustomed to. The 15 new MkII delays were drawn from the HX family of amp and effects processors, and include both more recent versions of classic effects and cutting-edge Line 6 originals such as the super-vibey Glitch Delay.