Pegase makes files audio MPEG-1 Layer 1
http://aminet.net/package/mus/misc/Pegase
http://aminet.net/package/mus/misc/Pegase_src
ADPCM4 is less demanding and has better sound quality than MPEG-1 Layer 1
in the archive DelfAIFF there are sources of players "Amiga" AIFF-ADP4 (DVI/IMA-ADPCM4)
http://aminet.net/package/mus/play/DelfAIFF
[youtube]https://youtu.be/eWYaBq8FXQw[/youtube]