Check the listing for details. Studiologic SL73 MK2 73-key MIDI Keyboard Controller. Condition: Very Good - Refurbished. Listed at 539.96 USD. Authentically Weighted, Lightweight MIDI Control Discerning producers and musicians looking for lightweight MIDI control with modern playability, look no further than Studiologic's line of SL MK2 keyboards! Boasting an updated feather-light keybed with authentic aftertouch, hammer action, and a color display, the SL MK2 series lets you maintain complete authority over your sounds and software. SL MK2 keyboards' highlighted asset is the 4-zone programmable key range, granting you consistent control over four of your most important parameters, instruments, and utilities for immediate use in performance situations and studio recording sessions alike. Got an entire setup to integrate? The SL MK2 can handle any rig you throw at it via modern USB-C interfacing, MIDI 2.