I will donate some money (not much, but what I can) and encourage others to do the same.
That's not necessary. I just mentioned in several topics that I will stop most activities.
With regard to the AUX button: It is part of the MOD/SRC carroussel, which means it should already function for the AUX button. Please try the FytHWOnekey.
Edit: It means you have to enter the "Configure the options for the MODE ..", and then "Configure the AV option". I will expand the string there.
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