So you use VarAC and OmniRig. but you want VarAC to set your frequency with the narrow filter FIL3 instead of the default filter FIL2. So here is a quick solution:
Close VarAC and OmniRig.
Go to "C:\Program Files (x86)\Afreet\OmniRig\Rigs" (or where OmniRig is install)
Look for the file IC-7300-DATA.ini
Open it with a text editor.
Look for this section (that starts with [pmDIG_U] and replace with this:
[pmDIG_U] ; These lines select USB-D for USB digital mode Command=FEFE94E0.2600.01.01.03.FD ReplyLength=16 Validate=FEFE94E02600010103FD.FEFEE094FBFD
Make sure your OmniRig is set to IC-7300-DATA:
Make sure your VarAC is set to USB-D
de 4Z1AC - Irad