Hey guys - got a 97 E420 w/ factory head unit with an Alpine CHM-620 6 disc changer connected by a Blitzsafe adapter - seems to play fine, except for the fact in the background (almost on a different "channel") there is a beeping noise that coincides with the seconds as they count as the disc plays. This is on a burned disc, I haven't tried a store boughten one yet. The noise gets louder/quieter as you adjust the volume - it's maddening, as you can imagine. Is this some kind of interference I can eliminate?

Mucho thx.