[SLUG] hardware question - wah-wah/volume pedal to plug into serial port?

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I'm a software guy. Unfortunately, I don't have a great head for
hardware / electronics yet. I wanted to rig some kind of
wah-wah/volume pedal type device to a computer input (non-audio), like
a serial or USB port for example. Something that I could vary the
intensity of a signal and read the change or value programatically.

Does anyone have any experience with anything like this? Apart from
the Serial-HOWTO which I am in the process of reading, does anyone
have any suggestions or recommended reading? I don't have any pedal
or anything picked out yet... cheap is good :)

Thanks,
~ Daniel
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