I'm trying to use the extmute_on, extmute_off function in hijack to switch to Aux when the mute line is at 12V and back to player when it isn't. I've read the FAQ entry and have the following lines in my config.ini

[hijack]
extmute_on=b9461d
extmute_off=b9461e



However I get a hijack config error message on boot up and the mute does just that rather than switch to Aux.

Any ideas please?