To fix it you will have to use a root explorer and delete system/etc/permissions/android.hardware.audio.low_latency.xml (well, this isn't a proper fix but a good workaround until it is fixed properly
AOSP specific bugs
No hwrotation
No hwrotation (meaning the boot animation is in landscape instead portrait on 7inch Tab2). We don't consider this as a problem, as autorotation will take effect after bootup anyways and most 7" tablets (like the Nexus 7) work this way as well.