I'm looking for two pieces of signal processing software for the Windows PC
platform.

The first task is to apply a 1/3 octave EQ to a sound card output regardless
of what playback software is used. More than likely the soundcard will be a
turtle beach Santa Cruz or Soundblaster Audigy 2. Would like other
suggestions in the sub $400 price range if possible.

The second task would be to apply variable bass management to the sound
cards 5.1 channel outputs. Or in other words, apply a low pass filter for
the bass channel and high pass filters for the mai and surround channels. I
would like the ability to adjust crossover frequencies for sub, surrounds,
and mains.

Please help. If you don't specifically know a software, can you at least
point me in the right direction?

Thanks,

Ge0