Well, I'm using
mp3Play on an A2000/060, with standard sound, and this works okay! Seems to latch on to MPEGA which I also have:
Short: Very small GUI for MPEGA
Uploader: carls@kajen.com (Carl Svensson)
Author: carls@kajen.com (Carl Svensson)
Type: mus/play
Version: 1.1
Requires: ARexx, rexxreqtools.library, MPEGA
M P 3 P L A Y 1 . 1
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(c) 2001 Carl Svensson
What's This?
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mp3Play is a small (almost tiny) GUI for MPEGA, the Amiga MP3 Player.
It's written in ARexx and needs RexxReqTools.library to work.
Contents of this Distribution
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mp3Play The GUI Script
mp3Config Configuration Script
ReadMe This file
Requirements
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· ARexx (with RexxMast running)
· MPEGA
· rexxreqtools.library (available from aminet, reqtoolsusr.lha)
No AHI, 24-bit Workbench screen or PowerPC CPU is needed
for it to look and sound good 
I guess the GUI is blazing fast even on a vanilla 68000 machine,
since it only uses ReqTools. I haven't tested this though.
Installation
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1. Copy the mp3Play directory to the wished destination
(for example, your hard drive)
2. Run mp3Config. This script is quite self-explanatory,
so I won't bother to explain it here.
The default MPEGA options (-d 2 -q 1 -p 3 -b 32) gives
me a clear, crisp sound using only about 25% CPU on my
A1200 with a 50MHz 060. However, you might wish to
replace these with the ones of your choice.
mp3Config creates a file called "mp3Play.cfg" in your
s: directory. It's a very small file containing
only one line of text.
Usage
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1. Run mp3Play
- From Workbench: Double-click the icon.
- From CLI: 1> rx mp3Play
2. Now the GUI appears. It has three buttons:
Play, Stop and Quit.
The Play button throws up a file requester
(NO multiple choice available). When you've
selected an mp3 file, mp3Play starts playing it.
If mp3Play is already playing a file when the
Play button is pressed, mp3Play stops playing
the old file and throws up a file requester.
The Stop button stops playing.
The Quit button stops playing and closes the GUI.
The Author
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Contact me by mail (carls@kajen.com) or
visit my HomePage (http://carls.1av10.nu/).
To Do
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mp3Play v2.0, currently in development, will feature
a playlist and more GUI buttons ;-)