I wish I could help, but I can't really help much not physically checking everything out. Every Scosche interface I have used has worked flawlessly. But I do find that the chime speaker is a bit annoyingly loud. An easy fix is to cover it with masking tape. That muffles the sound just a bit, and you can still hear it.
What about hooking a different speaker to it?
Something that will be less likely to drill through your skull on every beep?
