Considering you need a dual core x86 system @ ~3GHz to perform decent PS2 emulation, I seriously doubt that the pandora will have any chance of being able to emulate it. I really think Dreamcast/PSP emulation will be the upper limit of what is possible for this hardware.
This unit would be a...
You could just install FFDShow and create a bandstop filter at that particular frequency.
Then in winamp move your audio file types to the directshow decoder and they will all be passed through the filter.
You can also upsample you audio and other fancy things too...
These have the mechanism you are talking about:
http://www.amazon.com/Leather-Eyeglass-Holder-Case/dp/B0007ZHC0Y
Love the case, would really round off the presentation of the device when we show it to people. I had to create an account just to comment on it :D
I do agree with the darker...