what do I do worng?

[reeno]

I've got Android 5.1.1 working perfectly and decided to try both the Android 6 and 7.1 releases from official sites.  I get them to boot up fine and edited the appropriate file to make sure its displaying on hdmi fine.  However, both 6 and 7.1 have no sound output. 

Was there a specific config edit I needed to make to fix this, and could someone point me in the right direction?