Hi All,
I'm looking to buy a new Pioneer DEH2220UB HU and it has the mute wire function. I've been informed that to activate this mute function manually, it's a simple case of attaching the wire to ground.

Now I already have a seperate sat nav and it would be useful to have it mute the HU when its speaking. The sat nav software emits a 'ding', which from what i've read is used to activate a mute function in time for the actual instruction as well as tell you its going to say something. How would i go about doing this or is it a silly idea?

Kind regards,