for those of you having audio cracking, you have to download the Nightly Build I downloaded the master-armeabi-v7a from the 3rd of August and its been working great so far, no more voice cracking. Good luck!
I've got exactly the same problem on my nexus 5, however when I did the same install on a HTC and S4 they both sound fine. Mine on the other hand is so crackly that I can't watch anything. Any help would be greatly appreciated