[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] zmore:
Ok, so I initially replied to someone that my audio was fine, and it is in most cases, but I've since run into the Google Music fail (on 12/29-test4) where it doesn't play and in some cases just freezes the UI up completely (though it responds to an adb reboot). Google Music did workforme the very first time I tried it after flashing though... and, it works again after clearing the app's cache/data again, but only for a single song.

partial logcat at the moment I hit play (w/o headphones connected) and my phone froze:

E/Sensors ( 653): accelHandler -0.156874 8.307125 4.597240
I/AudioService( 653): Remote Control registerMediaButtonIntent() for PendingIntent{421491e0: PendingIntentRecord{42a54b70 com.google.android.music broadcastIntent}}
I/LocalDevicePlayback( 3052): play: currentPos=0
I/AudioService( 653): AudioFocus requestAudioFocus() from android.media.AudioManager@41a8fa08com.google.android.music.LocalDevicePlayback$6@41ac1590
I/LocalDevicePlayback( 3052): stop: willPlay=true, currentPos=0
I/LocalDevicePlayback( 3052): stop: willPlay=true, currentPos=0
I/LocalDevicePlayback( 3052): open: id=[8260, DEFAULT], playPos=0, fromUser=true, track=1 X 4
E/WVMExtractor( 241): Failed to open libwvm.so
D/AwesomePlayer( 241): Tunnel Mime Type: audio/mpeg, object alive = 0, mTunnelAliveAP = 0
D/AwesomePlayer( 241): Normal Audio Playback
D/AwesomePlayer( 241): matchComponentName is set to MP3Decoder 330240000, mime audio/mpeg
W/AwesomePlayer( 241): Trying to create tunnel player mIsTunnelAudio 0, LPAPlayer::objectsAlive 0, TunnelPlayer::mTunnelObjectsAlive = 0, (mAudioPlayer == NULL) 1
D/AwesomePlayer( 241): LPAPlayer created, LPA MODE detected mime audio/mpeg duration 330240000
I/HeadsetService( 1826): New audio session: 7
D/AudioPolicyManagerALSA( 241): profile found: device 2, flags 1001, samplingrate 44100, format 1, channelMask 3
D/ALSADevice( 241): route: devices 0x2 in mode 0
D/ALSADevice( 241): No valid input device: 0
D/alsa_ucm( 241): snd_use_case_set(): uc_mgr 0x41ef9fc0 identifier _enadev value Speaker
D/ALSADevice( 241): switchDevice: mCurTxUCMDevivce None mCurRxDevDevice Speaker
I/ALSADevice( 241): a2220: txDevice=(null) rxDevice=Speaker
D/alsa_ucm( 241): snd_use_case_set(): uc_mgr 0x41ef9fc0 identifier _verb value HiFi Low Power
D/alsa_ucm( 241): Set mixer controls for Speaker enable 1
D/alsa_ucm( 241): acdb_id 15 cap 1 enable 1
D/alsa_ucm( 241): Setting mixer control: PRI_RX Channels, value: Two
D/alsa_ucm( 241): Setting mixer control: RX5 MIX1 INP1, value: RX1
D/alsa_ucm( 241): Setting mixer control: RX5 MIX1 INP2, value: RX2
D/alsa_ucm( 241): Setting mixer control: RX6 DSM MUX, value: DSM_INV
D/alsa_ucm( 241): Setting mixer control: LINEOUT2 Volume, value: 100
D/alsa_ucm( 241): Setting mixer control: LINEOUT4 Volume, value: 100
D/alsa_ucm( 241): Setting mixer control: RX5 Digital Volume, value: 65
D/alsa_ucm( 241): Set mixer controls for HiFi Low Power enable 1
D/alsa_ucm( 241): Setting mixer control: PRI_RX Audio Mixer MultiMedia3, value: 1
D/ALSADevice( 241): close: handle 0x41ae2610 h 0x0
D/ALSADevice( 241): open: handle 0x41ae2610, format 0x2
D/ALSADevice( 241): Device value returned is hw:0,4
D/alsa_pcm( 241): sel.id.dev_class= 3
D/alsa_pcm( 241): sel.id.dev_sclass = 0
D/alsa_pcm( 241): sel.id.card = 0
D/alsa_pcm( 241): sel.id.device = 4
D/alsa_pcm( 241): sel.id.subdevice = 0
D/ALSADevice( 241): handle->format: 0x2
D/ALSADevice( 241): setHardwareParams: reqBuffSize 262144 channels 2 sampleRate 44100
I/LocalDevicePlayback( 3052): setNextTrack: id=[7259, DEFAULT], playPos=1, track=Let's Get Rocked
E/Sensors ( 653): accelHandler -0.138911 8.313113 4.586462
I/Sensors ( 653): **** Motion ****