I think I've figured it out, thanks to this guy -
https://www.youtube.com/watch?v=tcP_CWwd1Ac
Master Send 'uncheck' for Tracks 2 and 3. Master Send 'checked' for Track 1 KBmix.
Monitor-On only for Tracks 2 and 3, Monitor-OFF for Track 1 KBmix.
Record Disabled Mon only for 2 and 3, Record Stereo/Mono for Track 1 KBmix.
This gets the faders to work the level live going into KBmix Track 1 while recording the live mix to KBmix Track 1 in my situation.
Makes sense, sort of.... ;-)
Aus.