Found this on a Yamaha CX5MII (so you will be able to confirm ;). I typically have the 60HZ.COM (https://github.com/sdsnatcher73/50-60hz) in my AUTOEXEC.BAT. This allows any MSX with a V9938 or V9958 to switch to 60Hz (not just MSX2). If I run VGMPLAY on the CX5MII in 60Hz the program freezes (it probably fetches frequency from BIOS but does not check VDP on MSX1 computer).