I don't know if this info has already been posted or not but I thought I would pass it on for anyone else installing their LI.
I finally got around to pulling my radio headunit and hooking up the LI's mute function. Initially I couldn't get it to mute my radio. I then got out the mutimeter and tried to see where the problem was. The problem was the LI mute wire was not grounding during the voice alert like I thought it should. Several frustrating minutes later I thought maybe it doesn't mute during the welcome and parking audio so I went inside and grabbed a TV remote. Sure enough as soon as I activated the unknown gun audio it muted my cars stereo.
Lesson learned today is the LI only mutes during real threats and not during startup audio. Hopefully I may have saved some other people from experiencing the same aggravation I went thru.