[AT&T Samsung Galaxy Note I717] CPA Poke:
Man actually I've switched to the ViPER4Android mod, combined with MegaBassBeatsv3...the instant I landed on it I completely abandoned my seemingly never ending search for the perfect audio mod (or at least the perfect combination, as AC!D seemed to have a different effect (therefore requiring different tweak setups) on every ROM I flashed. When I flashed MBB only, the bass was ridiculous and grinding but everything else kinda took the back seat (losing some of the mids and highs that make certain songs... Radiohead's Amnesiac and OKComputer albums, for example). When I flashed Viper only, I had a fantastic spectrum of sound and clarity but the bass was lacking (ineffective for the dubstep and rap songs that I may or may not listen to on occasion).

So, even though both mods didn't really advise users to combine with other mods, I figured what the hell. Installed them both, and sweet Jesus - best sound quality I've ever had on both Bluetooth (in my car) and headphones. This was also a frustration I was having with AC!D, that sometimes it would work great in my car but then it would be iffy on my headphones...other times it would be the opposite.

Just some minor EQ tweaks on PowerAmp, and I can now sit back and listen to an infinite array of music genres, on both Bluetooth and headphones, and not have to give a second thought to tweaking anything after my initial setup (of which I set up on Viper and Poweramp only once, and then restore data on those two apps from my Nandroid backups using TiBu).

I've also made it super easy to flash by combining both into the GAPPs package that I flash on each wipe (Bataga, I got an N7 and the zip works great on there too...i think I remember you saying you had an N7 or an N10 at some point).

Here is the link to my custom GAPPs package with mods baked in...I also have Google Keep and the new Play Store apk in here, as well as some of the other apps that I don't use (Google+, etc) taken out because I always use TiBu to remove them anyway. Just flash it your ROM, then install the ViperFX app (only that one, not the XHiFi one as I didn't have much luck with both of them installed at once).

Here are links to the respective threads so you can play around if you'd like:

MBB v3 (for JB ROMs):

http://xdaforums.com/showthread.php?p=31204141

MBB v2 (for ICS ROMs):

http://xdaforums.com/showthread.php?p=33013589

Viper:

http://xdaforums.com/showthread.php?p=39156703

If you want to try to replicate my setup, here are the GAPPs with both mods included + Google Keep + the new Play Store apk:

http://db.tt/FNI7lVgo

Then just install this app only:

For JB ROMs - http://db.tt/jL2RXz1L

For ICS/GB - http://db.tt/ARoCiCyB

And here is a zip that you can flash AFTER you install the Viper app itself that should give you the setup that I currently have for the app, if you wanted to at least start from there and tweak as you see fit based on your listening setup. (I just figured it took me a long time to finally get the right combo, I'd at least share it with everyone else to see if it would work for them)

http://db.tt/QRvCUlvp

Not trying to diss AC!D one bit here...just found a setup that works for me and thought it you guys might want to try it out as well. I'd love to hear feedback.