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From the looks of it, you look like you're lost and no one here wants to help steer you in the right direction. I'm not going to be much help toward your project but I'll tell you why you havent seen anyone attepmt this project. It sounds like you are trying to hammer a square peg through a round hole. Unless you have the skills, time, and money to create such a thing, then by all means go ahead. Otherwise quit while you are ahead.
There are multiple issues with the type of project you're trying to create, such as:
1. How will it interface with the stock radio?
2. Construction-
A. How to interface your microcontroller with a jump drive, USB.
B. How will you control the tracks
3. Sound-
A. You will also need a DSP to convert the digital data of the songs into analog waveform. That will require either additional hardware and/or software.
4. Will you also need a display for the song information.
A. Even some iPod to factory addaptors cannot display track information
Like Jahntassa posted before, you might as well get an mp3 player because all of that has been designed for you. Unless you can find an mp3 player that accepts a USB jump drive port as its memory, then you are more than halfway to completion.
Its not that bad of an idea, But a hard sell. My one suggestion to you is to toss out this project you have in mind and pick up a new headunit that already has USB jump drive support, i.e. insignia has a cd/radio with a USB port.
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"In the beginners mind there are many possibilities, but in the experts mind there are few."- Shunryu Suzuki
"Do it right or don't do it at all"
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