Reassigning "permanently assigned" USB (parallels 6)

When hooking up my iPod for the first time, I hit the option to permanently assign it in Parallels 6. Unfortunately, I accidentally selected for it to be permanently associated with my virtual machine.

I'm trying to figure out a way to remove that permanent association so I can associate it with my mac instead, but am having no luck. (What existing documentation I can find are for parallels v4.)

If anyone has any suggestions, I'd greatly appreciate it.