It would be nice to know that link. I used a peripheral-aamp adaptor in my Yukon Denali and replaced my indash cd changer with a kenwood cd changer and ran my empeg thru the auxillary rca ins of the peripheral adaptor. By LEAVING the wires that ran from the radio to the stock indash cd chnager and connecting everything to that my onstar still works except now the empeg (or kenwood changer) will not automatically mute when onstar is activated. My temporary fix is to switch to FM when using onstar. It would be nice to auto mute (maybe that box your talking about does that?) Anyone know?