The fresh fMSX-Windows 3.9, as well as the portable source code for fMSX-Unix (and Linux), is available from the fMSX home page:

http://fms.komkon.org/fMSX/

This version includes many improvements to the AY8910 PSG emulation. The envelopes mechanism has been rewritten and the envelopes length adjusted. I have switched to logarithmic volume values and set the white noise volume to be 50% of the melodic sound volume. Finally, the white noise frequency computation has been fixed and the emulator now supports .MX1/.MX2 ROM files.

Have fun!