Actually - just to throw the cat amongst the pigeons - have you considered buying him a portable DAISY player for Xmas? Instead of converting each text book to mp3, you can just put EPUBs (or TXT, or RTF, etc - check the device's specifications) onto an SD card and put them in the player.
Once you decide which way to go, if you're having trouble I'm sure more help will be available here, just ask.
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