Using a foot pedal or other device with iPhone

I am a music teacher and would like to make better use of the iPod Touch and iPhone by being able to hook up a USB foot pedal to the iPhone and send a hot key. For example, when it plays an MP3 recording, I'd like to be able to easily rewind or restart or pause the recording. I can do it on the computer but have till now not found anything that will let me do this with the iPod.

Any ideas?
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You would have to take your shoes off and use your toes, I think, as the remote is quite small, and it may take some practice (but as a musician you're used to this...)   A device like this might work:

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DatabaseDuaneAuthor Commented:
This idea is pretty close to what I imagine and gives me hope that someone has an external device that would work. I would need it to work with other apps, though, like Quicktime player, not just iTunes. Your answer, though, is deserving of points when the time comes!
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