I really wouldnt try playing no MP3s on an Amiga. Pretty much would eat the entire CPU to play an MP3 at a not so high quality. I have done it with a 68030/50mhz, but only program even worth it is Prayer2.... Which I found to play anything decent using the Amiga 1200...
**And no crap about this A2500 being high quality and it can do faster. I even had 32mb ram on the Accelerator which for sure was 32bit and timed fast.**
So download PRAYER2 form aminet and give it a try.