I used ViPER on my Note 2 and will not go without it on my Note 3. The first thing I did after rooting was install it. It's MUCH easier than it use to be. It's just downloading a 2 zip files, removing the 4.? apk's from them, placing them on your N3, installing them, opening them up. The drivers are auto downloaded now.
On the ViPER page [link above], go to the download section and download:
Important: v2.3.x update is special. Must read special instructions above!
FX version v22.214.171.124 (Android 2.3~4.3): MediaFire
Notice: Please install v126.96.36.199 as USER app.
XHiFi version v188.8.131.52-1 (Only Android 4.x): MediaFire
Note: Driver version will shown as 184.108.40.206 (See In-app Changelog and make sure there's 2102-1)
Extract the files to your desktop.
ViPER4Android_XHiFi.apk to your SD card and install them
Run FX/XHiFi app from drawer, allow root access.
When driver installation prompt, choose Yes to "Install/Update". (V4A auto detect and install correct driver)
After installation done, Reboot device.
Go into Settings/Device/Sound/Music Effects and select ViPER4Android FX
It's ready to go. Open up ViPER4Android FX and XiHiFI and enable both.
That was the easy part. Getting the sound the way you want it is the hard part. A lot of tweaking.