Here’s a DIY MOD player you can build (MOD is sorta like a MP3, popular in the 80’s with Amiga computers) – “TRAXMOD is a small digital audio player using the Philips LPC2103 ARM7TDMI-S high speed microcontroller chip (prior versions were based on Microchip dsPIC DSPs). Currently, the ARM port can play raw wave audio streaming off of a FAT formatted MMC/SD Card at 44100Hz, 10-bits, stereo. It is also beginning to play small 4 channel MOD files. The hardware for TRAXMOD/ARM can be built using a BBMICRO Protoboard and a few additional low cost components. “ – Link.