Another option that would work with any wifi-enabled kindle is a wifi foot switch. You might use an OpenWrt router for such a thing, and use the router to tunnel your switch over wifi SSH to any Kindle wifi-connected to it.
You can connect your foot switch across one of the internal switches in the router.
You can also connect across the LEDs that you can control from software, to use as output connections, like I did for the SD card interface shown in the above link.
No need to use that router though. There are many hackable wifi devices and USB devices that could be bent into submission and forced to do your bidding.
The kindle can also support wifi host mode so it can act as a wifi hotspot with appropriate software. A wifi footpedal could connect directly to the kindle with just a wifi client such as the one built into this SD card:
http://en.wikipedia.org/wiki/Eye-Fi
It all depends on how much time and/or money you want to spend on implementing this custom hardware and/or software. Who knows -- perhaps there is an off-the-shelf wifi footpedal you can buy already? If not, somebody could make some money manufacturing them (until the Chinese come out with a cheap clone that sells for much less than the cost of your parts, including shipping).
Quote:
Originally Posted by jbefumo
I've mounted my Kindle (wifi) to a microphone stand, and use it as a less obtrusive replacement for my old binder full of lyric/chord charts when performing live.
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I hear that the Kindle DX Graphite with its larger 9.7 inch screen is quite popular with musicians for displaying sheet music.