What (other than sound production) electrical functionality was lost when bypassing the OEM amp? I'm trying to determine if anything more than front/rear/bass/treble, etc. was lost in the install.

The reason I ask is the following: The amp "communicates" to the K_Bus and this connection is lost when the OEM amp is not used. No where can I find what this connection does, but I suspect that it gives front/rear/bass/treble/other? controls. Losing this is not a concern, because the 3SIXTY.2 more than compensates for this.

Thanks.