Guess what: there is someone who did just this and did it BETTER than wadia. the only problem is, and it's a major one unless your only goal is the sound, is that it cant display the track number or the time elapsed. the guy who made it wont market it because he thinks the flaws will prevent anyone from buying but i can virtually guarantee you that the sound will floor you. email albert at space-tech-lab.com and ask him about it. i dont think he'll build you one but he might send you the plans.
good idea, though, you're on the right track. a long long track, but the right one.
good idea, though, you're on the right track. a long long track, but the right one.