Alrighty...
EXPORTING
There are several pieces of software out there that can do this for you. Due to the fact that my Mac broke about a year ago, I'm only familiar with relatively old apps. I know SoundApp can at least play the sounds -- and I believe it can export them somehow as well.
What I've used in the past is Sound Editor (an old, freeware sound program, not to be confused w/SoundEdit 16). This can actually open the EV Sounds file and let you open the resources up, and you can just save it as a new file.
IMPORTING
AIFF files don't work in EV. You need something in something called System 7 Sound format, which is the kind that'll play if you double-click it in Finder. A program like SoundApp will convert it for you. Make sure it's at 11.127 Khz, convert it, and then you can open it in ResEdit and it'll help.
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Hope that helps. Maybe I should put this up on the web as some sort of guide or something; it seems to be a frequent topic.
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Mike Lee (Firebird)