Today I finished building MSX-Music (based on a YM2413) into my FS-A1FX
Here is a Demo Video where you can hear the difference.
On this picture the extra circuit I’ve added to get the FM-Sound.
Only thing left is to add the WSX Music ROM to my machine. To test the functionality I’ve flashed a flashrom with the WSX Music Rom and it is working, as you have seen in the video.
To add the circuit, I used this part of the Service Manual of a FS-A1WSX:
C12 50V 1uF
C46 50V 2.2uF
I’ll update this post, when I have the Music ROM build-in also.