Stereo Tool

Hey guys,

at the moment i'm one step away from saving myself 500 euros if i don't have to buy a gladen mosconi 6to8 dsp for my car.
But anyway... On to my problem. I have the following setup:

Car + Computer, I play sound through the digital output of the mainboard soundcard,
feed this digital signal into an terratec dmx 6fire usb soundcard. On the pc i run standalone
stereotool, select the appropriate in and outputs in the terratec soundcard and use the
6 chinch out (3 stereo channels) from this to go into my amplifier.

The current setup at the moment icludes further
terratec line out 1 > amp (lowpass) > subwoofer
terratec line out 2 > amp (highpass) > Audio crossover (Frequenzweiche) > mid freq / high freq speacker

Now this works very well already, but to achieve even better sound , i would
like do the frequency splitting with some sort of software which will read the stereotool
output and allow me a setting like this:

line out 1 > amp > subwoofer
line out 2 > amp > mid freq speakers
line out 3 > amp > high freq speakers

And to top it of i would like to add a left channel delay to the mid / high speakers because of the driver position in the car.
I know this is already possible with st but as the delay would also count for the subwoofer as well i don't know how healthy that would be for it.

I know this setup is crazy , but if there is a way to do this please answer, 3rd party tool is fine or maybe the creator of stereotool could help me in some way
I've been trying to program a solution myself and succeeded in feeding the audio from an input to an output, but when it comes to the processing i fail ...

If you have any further questions or information you need, just ask!

With Regards and thank for your help,
meld0