If you haven't sorted out the channel mixing / Windows driver issue, I'm not sure how you adjusted the correction amp.
Do you get +5V on the color channels when the circle is playing?
I think you might have solved your problem as far as Windows and Spider Player are concerned. I think your issue now is with Spaghetti.
There is a bunch of stuff you can test with here:
http://laserboy.org/free_art/
Look at countdown. You should DL this and make a wave file of it in LB and see if it plays in Spider Player.
Using the default settings to make an optimized wave should produce a usable wave.
James.