How to put new audio track to MKV file??

[golafs]

Hi,
Have 1 question. The "problem" is that very few BD movies exist in my native language. F.ex have only found 1 blue-ray pixar film (toy story) with dubbed audio. Fine with me but my kids don´t understand much
So i´m wondering if I have BDrip (MKV) file and DVDrip (avi), how can I edit the film by taking audio from the .avi and put to the .mkv file?
only video editing software I have is Sony Vegas. Can I f.ex. use that?

[Baldrick]

Use multiplexers, demultiplex the audio from the avi with Pazera Free Audio Extractor and then multiplex it to the mkv with mkvtoolnix. More multiplexers, https://www.videohelp.com/tools/sections/video-de-multiplexers

You might have to resync the audio though. Use an audio editor then.