well the £8 wired device arrived & works.. but it stops working after a sleep wake, and has to be unplugged, replugged.
I though it was powertoys going awol but no, all the key remaps survive restart, sleep wake etc. i realised that I never use the number pad when typing, so i mapped -, + and 0 keys on the keypad (without messing up the main top row keys on main kb), to media play/pause, next track, previous track to those for controlling play-along tracks
that works for spotify , even when I have the pDF in full screen
i may look for a better one that stays connected always but its hard to check for that in amazon reviews. I got the pad balanced on the piano top, with a stick pad, but I don't fancy having to unplug it at the pc multiple times a day, and I dont like leaving PC awake when not in use.
PDFxchange has a useful stay awake option for when its in full screen, so it wont sleep half way thru a tune...
this is the cheap one.
https://smile.amazon.co.uk/gp/produc...?ie=UTF8&psc=1