Yes, Castr's Player support multiple audio tracks sent via SRT.
You can customize the player with different audio track labels using our player API, which you can find here: Castr Player API Documentation.
If you want to name each audio track, you can do so by listing the names separated by commas in the 'tracks' parameter. Here's how to set it up:
Syntax: tracks=[name1,name2,...]
Example: tracks=english,french
This lets you label the audio tracks as "english," "french," etc., in the player.