That awkward moment you discover you are psychic (Woohoo!) or this London-based app developer reads your blog (Woohoo!).
RjDj released their version of this app I'd described in an earlier post..
Good luck you guys! Hope you sell a bazillion copies! :)
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Follow-up:
So it's come to my attention that there's this terrible movie starring Vince Vaughn and Kevin James called "The Dilemma " in which one of the subplots involves building electric-car engines that sound like muscle-car classics.
I never saw the movie — and based on the reviews , I would suggest you don't either — but it sounds like this subplot has a similar concept. So yeah, this auto audio enhancements idea has been out there for years.
Time to get in the time machine and fix all that — as well as "fix" who invented this brilliant mini pillow-ring concept.
Time travel for the win! Muahahaha!