Finding and Adding an Audio Stream

[Anubis]

Here's the deal I already have already downloaded Angel Beats a While back but recently they have released the english dubber version, now my problem is that how do i find the english audio stream and if I somehow manage to get the audio how do i add it too my MKV files as another audio stream .... Guys If u have got the audio or if u can somehow extract is please let me know, ull be doing me a favor thanks in advance

[† L4ugh]

Even if you find the english track there is no guarantee that it will sync with the video you already have. This is the problem you see people having when adding the english tracks to japanese bluray releases. If you do get an english dub track that's synced then all you should need would be mkvmerge.