Thanks Rharv, but I'm only using BIAB at the moment. It may well be the same. I'll contact BIAB support. I think it has a lot to do with what midi sounds BIAB styles throw up in the melody track. Now I delete the melody track data before I add any CC commands or patch change commands. Otherwise you end up retyping the cc commands et later as they get wiped by the delete:-)

Windows 10 Home 20H2 Build 19042.487
BIAB 2021 (Build 818)
Intel(R) Core(TM), i3-4160, CPU @3.60 GHz RAM 16 GB, 64 Bit X64-based processor
Zoom UAC-2 (USB 3 interface-built in midi)
VoiceLive 3 Extreme, Sputnik Valve Condenser Mic