Mute analog audio when another source is selected

[miquelbb]

Using the Uruav Evo analog reciever here, but I guess this is common to every analog module.

When I select LineIn audio to use an external mic, the resulting DVR always mixes the selected audio with the analog reciever audio (usually RF noise). Some analog recievers (ie, Rapidfire) have an option to mute its audio, but some others don't.

There could be in the Recording Options menu an entry for 'Analog audio' among the other options in case I had a mic attached to the vtx. But now it's always there ruining any other audio source I choose.

I guess the headphones output reflects the same behaviour (?), but haven't tested it.