[Nexus 6 Themes and Apps] :
Hey [MENTION=4445176]guitardedhero[/MENTION] - here's my working setup:

ViPERAtmos 5.2 - Dark Sony Beats Edition (Permissive)

Once again, the only changes from 5.2 are replacing the default V4A 2.4.0.1 with the Dark Material 2.4.0.1 APK for those who preferred it from 5.1 or previous versions, and the removal of the su.d script for use with an outside solution for Permissive Selinux.

I've also tweaked my Lover of Sound profiles slightly to reflect the slight shift in the sound of recent versions and my preference for Dolby's surround processing now that it doesn't get interrupted as often with Memory Locker:

Sonophilos (Lover of Sound) Profiles

Lock Effect Mode - Headset (so Speakers/Bluetooth get all ViPER options)

UI Setting - Moderate/Expert (so you can see all these settings)

Headphones:

PlaybackAGC - Enabled, Moderate

ViPER-DDC - Enabled, audio-technica ATH-M50 (your headset here)

Spectrum Expansion - 0.5

FiREqualizer - (0.0, -0.6, -1.2, -1.8, -2.4, -3.0, -2.1, -1.3, -0.6, 0.0)

Convolver disabled, it's a major battery drain

Field Surround disabled, it's only really helpful on larger speakers

Headphone Surround + Enabled, Level 1

ViPER Bass - 40Hz, 8.0Db Bass Boost

ViPER Clarity - 8.0Db Clarity

Cure Tech+ Enabled, Moderate

Output Gain (-3.0Db)

Speakers:

PlaybackAGC - Enabled, Moderate

ViPER-DDC - disabled

Spectrum Expansion - 0.5

FiREqualizer - (0.0, -0.6, -1.2, -1.8, -2.4, -3.0, -2.1, -1.3, -0.6, 0.0)

Convolver disabled, it's a major battery drain

Field Surround disabled, it's only really helpful on larger speakers

Headphone Surround + disabled

ViPER Bass - 40Hz, 8.0Db Bass Boost

ViPER Clarity - 8.0Db Clarity

Cure Tech+ disabled

Output Gain (-3.0Db)

Atmos - Flat EQ, Dialogue Enhancer on for both internal speakers and headphones/aux (it tracks both separately), Surround Virtualizer off for both, Volume Leveler off for both.

I recommend adding the following section to build.prop:

#
# ViPER4Android
#
audio.deep_buffer.media=false
lpa.decode=false
tunnel.decode=false
tunnel.audiovideo.decode=false
lpa.releaselock=false
lpa.use-stagefright=false
persist.sys.media.use-awesome=1
ro.audio.samplerate=48000
ro.audio.pcm.samplerate=48000

-You can set the bottom two higher - check in your audio_policy.conf under compress_offload to see how high the dynamic sampler will go. My HTC One M9's goes to 192000 and so I have those bottom two samplerate settings set to that.

I also recommend adding the two values to audio_policy.conf as described in the OP, and making use of Memory Locker as advised in my previous post to reduce the chance Atmos gets killed. I also recommend the use of Don't Pause! as advised in my previous post so notifications go to vibrate when music is playing instead of "ducking" or pausing the music stream.

The combination of this mod and profiles and tweaks is an absolutely gorgeous sound out of the internal speakers, realizing the potential of the device much better and adding some substantial volume, and the headphone experience is practically theatrical. The sound and its processing also defies being interrupted, making for an immersive headphone experience or lengthy playlist jam.

--Cheers all, from Sonophilos the lover of Sound.