In MPC you can just press A to switch the audio track and S to switch the sub track instantly, or you can go into the settings and default language to always be Japanese and English subtitles to always be on.

In mpv (any reasonable player) you can just press # (some key) to switch the audio track and j/J (some other key) to switch the sub track instantly, or you can edit the settings and default language to always be Japanese and English subtitles to always be on.

>>17930
>you can edit the settings and default language to always be Japanese and English subtitles to always be on.
This is indeed what one should do, but it doesn't always work. Sometimes I find idiots who release videos with subs off but listed as eng subs(for use with eng audio as defualt)and 'jp' subs for English subtitles, where as others will have eng subs be English.

>>17942
Fair point. I've ran into releases like that myself.
It can't be helped.