the screens look good. i may try that. as for sound, with multiple screens there are obvious problems listening to multiple sound tracks. but since i don't understand japanese, i really don't need to hear 3 or 4 original sound tracks simultaneously... or even one. this leads into alternative sound tracks. while i don't do this all the time, i confess to having constructed sound loops from multiple sources (erotic phrases a girl has whispered/said/shouted, noises such as laughing/sighing/screamng, and even music). as the video loops are usually of differing lengths and are not synchronized, there is no need to attempt synchronization with the audio. in fact, the randomness of the audio adds a fresh element to the repetitive loops.
sometimes i just watch without sound. sometimes i make little or no adjustments. sometimes i hear a couple of sound bites from what i'm watching and i loop them (keeping the video portion of them off-screen), then mute the open screens. on occasion, i have added audio from western porn in a crude attempt at dubbing in some utterances that i understand. all these things are done on-the-fly by opening more instances of vlc. but i have toyed with the idea of using audacity or some other sound editor to do a more thoughtful job. one could even add in original dialogue with at&t natural voices or some other software. better than subtitles.
saw your other thread with the major project. good luck with that.