Here's what I'm trying to do. I want a car mount that charges, provides stereo out for music listening and a mute for incoming calls. Here's the problem. The Mr. Handsfree has an audio interrupt lead, but doesn't look like it has a headphone or audio out. The Seidio looks like it has a plug for stereo audio out, but no radio mute wire.

Do either actually do both? Is there another cradle that provides charging, stereo audio, and radio mute for the 755p?