I created a simple patch to avoid error on some Saturn models when Myst was played.
You can download the file here :
You can use SegasaturnPatcher to patch an ISO.
The patch was made with an european disc, but it should work for japanese and US discs also.
The patch replace the SND files with most recents one founds on Korean version of the game.
If you can't download the file, don't hesitate to contact me !