One of the more exciting features of Final Fantasy X on PC was the ability to choose between English or Japanese VO similar to 13. Sadly that wasn’t the case as we soon found out.
However, this being a PC game and all, modders have come to the rescue. A new mod which replaces the current FFX.exe file will allow you to play Final Fantasy X with Japanese VO and English subtitles. The file can be found here.
Keep in mind that I haven’t personally tested this (I actually like the English voices more) but people in the comment section have reported success.