My wife gave me a Big Knob! Now stop the chuckling, it's one of these by Mackie:
https://www.sweetwater.com/store/detail/BigKnobPass
As I have 2 computers in my 'everything room' (1 internet, etc, 1 music), I haven't been able to use my JBL studio monitors for regular listening, now I can swap out sources (internet computer/soundcard or music computer/Tascam interface) and speakers (JBLs or gateway computer boxes) easily.
Also got a new suede guitar strap and some strings.