You can use hex for extmute as well, just prefix it with 0x, as in extmute=0x123456

I suppose I oughta change it to just be "built-in", with "known" button names for "ExtMuteLow" and "ExtMuteHigh".

You could add some "VolUp" and/or "VolDown" to the mappings for the ExtMute codes.. but there's no "memory" for the mixer mode. I think you could get it to work with the .S (Shift) toggle, though, as in:

extmuteon.M=aux.S
extmuteon=aux
extmuteoff.S=aux.S
extmuteoff=Tuner

Cheers