Where can I buy an auto-switching (auto-muting) source selector?

Question

I have an aux-in on my car stereo, so far, it works great with my XM Roady XT. But I also have a PDA with a GPS software; which has an output for the voice prompts; also via a stereo jack. I do not like to hear my GPS prompts over my music, which is usually too loud anyway and my PDA's speakers are too soft. I want a device that automatically overrides my XM Roady's music whenever it senses a voice prompt coming from my GPS output. Is there such an auto-switching source selector in the market?

As a side note: buying a new GPS unit is out of the question. Plugging in a small set of speakers to my PDA is also out. And I'm not keen in switching between my XM and my GPS on that single Aux in jack manually. I'm looking for a simple, automated solution. Only an auto-switching source selector would do.

Answer 1

Check this product out:

http://speakercraft.com/#Products:171:LL-One

This will allow you to plug in two line level sources (XM and GPS) and have one as the default source and one that will interrupt the default only when a signal is present. You would probably have the XM as a default and the GPS as the one that will "cut in" when needed unless the GPS makes a lot of bleeps and clicks. This is designed for home use but uses a 12vdc adapter so it will work fine in a mobile audio application. It also has adjustable sensitivity and delay setting which can be really handy. This one is made by Speaker Craft but other companies also make them. It is called a "Line Level A/B Switcher". You may need 1/8" stereo to RCA cables to make this work, but they can be found at almost any Radio Shack. Good Luck!

Answer 2

My best set of advice would be to read the manual on your pda and see if you can disable the voice prompts.

Answer 3

i believe that is going to do the job if not call them they can help you
good luck

http://www.oemautosound.com/pc-386-88-dual-audio-interface.aspx