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What Mac app for time stretching 5.1 audio track?

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Need help to build MKV w. custom audio
I've got an MKV Bluray rip and a DVD-rip. The DVD is at 25 fps and the MKV rip is at 23,976 fps. I need to bring the audio track from the DVD into the MKV container using MKVtoolnix after having synced the audio track correctly as right now it's 4,270833% to short and to high pitched.

What is the easy way to go about this? If FCP is the best solution, I'm ready to get access to that but if something simpler can do it, that's even better. Audacity can handle MKV but not 5.1 AC3 and Amadeus can't just open MKVs...

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