Stereo signal path help

[CanadianX5]

I was wondering if anybody know the signal path for the stereo with DSP?
For example (starts at the cd player, travels to the head unit where the sound is altered by the DSP, then sent to the amp where it is divided up by crossovers and then boosted and sent to the individual speakers)
This is what im assuming.

Im going to be building a plug and play amp bypass wire harness that enables users to retain the factory head unit with all functions while adding seperate processors and amps without cutting any factory wiring.

Ill be able to figure it out but if someone has some knowledge about the route the signal takes post a reply please and help me save some time .

Thank you