Hello to all!
I made a highly precise (I hope!) emulator of AY-3-8910 and YM2149 sound chips with an audio renderer to wav. It understands YM format (but you may need to unpack a file with LHA tool). No ATARI ST specific effects (I'm from ZX Spectrum land) yet.
Hope someone here will find it interesting: http://sovietov.com/app/ayumi/ayumi.html