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How to link a number to a track (homemade mp3 player) ? Answered

Hi, i'd like to know if it is possible to link a mp3 file to a number on my mp3 player. I'd like to add a keyboard (0 to 9 ) where a number would be a music. 
eg : If you press 21, you get the 21st mp3 file and the player play it. 
I need some help to know how to put the keyboard and how to link music-number 
(and if you have ideas on what kind of things to use to do that ... feel free ! I'm a begginer)


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