This contains both the original audio track & subs and the commentary audio track and subs.
Look at [this reddit](https://www.reddit.com/r/araragi/comments/i2balw/monogatari_series_audio_commentaries_masterpost/) post for more info
### What are the audio commentaries?
The audio commentaries are secondary audio tracks present in the Monogatari Blu-rays and DVDs, that play over each episode of the anime. They feature a pair of characters discussing the episode as they're watching it... or more accurately, they tend to discuss everything but the episode. It's not just a chat between voice actors either : this is entirely in-character dialogue written by Nisio Isin. That's right, an entire 100 episodes worth of them !
The files were merged using a utility called [MonoMux](https://github.com/ss7m/MonoMux)