[Sprint  Galaxy Note 4 Android Development] kngdmond:
I uploaded a zip file to my server. It's a collection of ir's (impulse responses) and profiles. Simply unzip the file and copy the 3 folders and merge them into storage/emulated/0/ViPER4Android.

http://deathdesigns.com/ViPER4Android.zip

I'll leave the file there for awhile so people can download it.

Then open ViPER4Android, menu, load profile, and pick one out of the list. After the profile loads, you may have to change the device (bluetooth, speaker, headset, etc) in order to see the settings that have been loaded. Not all profiles sound good...they are just starting points. Each profile loads its own ir file which is designed for a certain speaker driver, headphone, or manufacturer.

To create your own, simply turn on the different settings, play with the eq's, enable the convolver option, load an ir, and select one from the list. Each ir produces a unique sound which can make your headphones or car speakers sound great, or some will sound bad...its up to you to find the sound you like....there is no right or wrong.

As far as the disappearing files within the folder...I'm still not sure what's going on. I've been experiencing all sorts of weird issues, mainly dealing with permissions.

Example 1) I created the ViPER4Android.zip file on my extSD card and it has file permissions of 0755. I copy the file to storage/downloads, and the zip file now has permissions 0660.

I tried using root explorer to change the permissions and owner and it just couldn't be done. I clicked on the zip file and I was able to see the contents, but when I extracted it, when I went to storage/emulated/0/SpeedSoftware/Extracted the folder was empty. Like root explorer was unable to write files.

So I went into settings -> applications ->Viper4Android FX - permissions to check. Storage permission was enabled. I toggled it off then back on. I checked exposed and made sure Viper4Android and root explorer were enabled to write to SD cards. I rebooted and went into recovery -> advanced -> fix context. Even knowing that fix context could mess things up, I did it anyways, then rebooted system.

I downloaded the Viper4Android.zip from my server. It still had file permissions of 0660. But this time root explorer successfully extracted the files and I was able to merge them into the proper folder.

I opened Viper4Android and was successfully able to load a profile. I tried to save a profile. It finally worked. The new profile was saved, but a new bug appeared. I tried to open the newly saved profile, but it was NOT appearing in the list. I opened root explorer and checked, the new profile did exist.

Baffled, I went to the official Viper4Android website and did some reading. Apparently there is a bug where Viper4Android had issues loading old profiles. They had an update that supposedly fixed it. So I downloaded the apk, extracted it, installed it, force stopped Viper4Android, and restarted it. Had the same issue. Profiles no longer were being deleted, new profiles were created, but new profiles weren't appearing in the list. So I deleted all the profiles except 4 of them. I created a new profile, saved it, tried reloading it, and the new profile was successfully loaded. So maybe Viper4Android has a maximum profile limit?? Just odd the new ones appeared after removing most of the profiles....or maybe the old profile bug still exists within Viper4Android itself.

I will say Marshmellow has some funky permissions I really don't like....or again maybe my base PJ1 is still messed up. I really don't want to clean install again...lol