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The only time I had ever had an issue was flashing a nightly dirty. I managed to recover the audio by installing viper4android.apk. The newer versions of V4A automatically detects if LPA (low powered audio) is enabled. It will give you an option to disable it, just tick that yes please button. Usually LPA only affects things like bluetooth audio so it wouldn't drain the battery as fast, but I know with previous CM versions they had a bluetooth audio issue. Most likely completely unrelated but there might have been a WIP that caused things to be construed. If another rom version works then i'd recommend just installing a stable release.
REMEMBER ~ you are able if you run stable