Modding the Soul Sonic rotary mixer. (I'm pretty sure this voids the warranty.)
New faceplate in what I call a "Peavey Circa 1982" motif, haha ... plus I'm adding an analog wet/dry control to the circuit and simplifying the cueing section. It's really an excellent platform to mod on, incredibly straightforward even with no schematic. Love the almost "PTP" style of parts of the circuit.
Also swapping a few of the non "milspec" components while I'm in there (cue selector becoming a Grayhill switch, headphone jack becoming a vintage Western Electric, stuff like that.) And the Pilot LED on the original is now mounted in the Headphone Jack.