DEMO: I can show you a demo of an Audio DSP WMP plugin, which does low-pass, notch, high-pass, all-pass, pitch, low-shelf, high-shelf and band pass filtering + EQ. Since it's a part of a project for another client, I'll need a couple of days to extract the non-copyrighted code and put up a demo for you.
I can also show you a DirectShow filter that does rate/pitch conversion if that;s interesting for you.
Please contact me so I'll be able to show you the demos.
Thanks,
Ivo