You have no idea how complicated the DSP system is.
There is no such thing as a (simple) upgrade on DSP.
Read these threads
http://www.xoutpost.com/stereo-system...?highlight=dsp

http://www.xoutpost.com/stereo-system...?highlight=dsp

http://www.xoutpost.com/stereo-system...?highlight=dsp


http://www.xoutpost.com/stereo-system...io-system.html


The last one is probably the most well explained threads I've ever read. It cleared up any questions I could possibly have had.
Let us know what you think after reading those posts.