[APP] Official ViPER4Android Audio Effects (FX v2.3.3.0) - New Features!

Important: New v2.3.x V4A has new package name, therefore follow this installation steps carefully.
1. Open old v2.2.x V4A, save the effect profile.
2. Uninstall old v2.2.x V4A. Complete uninstall, including both driver and app. Reboot.
3. Install new v2.3.x V4A, choose Yes to "Install/Update". (V4A auto detects and installs correct driver.)
4. Reboot, open new v2.3.x V4A and load effect profile saved in step 1.

Ipa.decode=true to lpa.decode=false
tunnel.decode=true to tunnel.decode=false
lpa.use-stagefright=true to lpa.use-stagefright=false

1. Download, extract and copy ViPER4Android_FX/XHiFi.apk to your device.
2. Install the apk as USER app or SYSTEM app is up to you. (v2.3.1.0 onwards)
3. Run FX/XHiFi app from app drawer, allow root access if asked.
4. When driver installation prompted, choose Yes.
5. V4A auto detects your CPU and show available driver modes below :

No modes: For processors with or without VFP .
Battery Saving: Available for all processors with NEON.
High Quality Mode: Available for processors with NEON.
Super Audio Quality: Available for processors with NEON.

6. Choose your desired selection.
7. After installation done, Reboot device.
8. If you want to use only V4A as audio effect, follow normal mode. If you want existing audio effects to work, follow compatible mode.

Normal Mode:
9. In Sound settings > Music effects, always choose V4A FX unless FX is not installed.
10. Open up V4A FX (and xhifi), in menu, FX Compatible Mode set to Normal Mode.
11. If not working, try Compatible mode before trying Force-Enable.
Compatible Mode:
9. Do not change anything under Sound settings/
10. Open up V4A FX (and xhifi), in menu, FX Compatible Mode set to Compatible Mode.
11. If not working, use Normal mode and disable other effects.

12. How to use IRS in Convolver? See IRS page: here.

Make sure your device is rooted and install latest SuperSU or SuperUser.
Make sure you install correct apk for your android version.
1. Complete Uninstall V4A (driver + app) and reboot.
2. Install V4A as USER app, begin with battery saving mode.
3. Use Normal mode, go to Sound settings>Music effects> and choose V4A(either fx or xhifi).
>>>Test.
4. If not working, switch to Compatible mode, go to sound settings>music effects> and select something else besides V4A.
>>>Test again.
5. If not working, return to Normal mode, change sound settings, enable Force-Enable.
>>>Test again.
6. If not working, repeat step 1 to step 5 but as SYSTEM app.
>>>Test again.
7. If nothing works. Disable or remove the default sound effect under MusicFX, then return to Normal Mode.
>>>Last Test.
8. If no help, submit a bug report.

HOT: Why some settings are missing?
A: Because you didn't read update log.

HOT: Why cannot switch driver mode? (battery saving or high quality)
A: Only CPU with NEON have choices. To change, uninstall and reinstall.

HOT: Why no effect?
A: See Troubleshoot.

1. Which to install? FX or XHiFi or Both?
A: The difference is explained in V4A main page. Install FX first. XHiFi is optional.

2. Where is the build.prop lines in instructions?
A: This step is optional. Those lines are not in every device. You can skip this.

3. Can I still install V4A if I already using other sound mods?
A: Yes, after installation, open V4A app and switch to Compatible Mode.

4. Why installation fail?
A: Root or SU binary issues. Use latest SuperSU.

5. Why is superuser not supported?
A: V4A does support superuser. Some superuser version have bugs, please use a stable version of it.

See more:

6. Why music lag after display off?
A: This is due to CPU speed too low when screen if off. Make sure you are not using some battery saving CPU governor.
Switch CPU governor to ondemand/interactive to increase CPU speed or increase minimum clock speed.

7. Where is minimal phase equalizer?
A: FIR Equalizer is the name of our EQ, minimal phase is a type of EQ. Its activated for High Quality Mode and Super Audio Quality drivers.

8. Why does the effect keeps on skipping/cutting (on off on off spontaneously)?
A: Submit bug report.

9. Why no effect on Third-party players such as Poweramp and TTPOD?
A: Disable their own sound effects.

10. Why no effect in MIUI player?
A: Try turn off MIUI default equalizer.

11. Im using Meizu, Flyme system, why effect gone after i display lyrics?
A: Flyme modified Android's Audio principle, so lyrics will be treated as music effect by the music player, so V4A cant be used.

12. V4A FX/XHiFi effects suddenly disappeared?
A: Android system kills certain processes due to memory limits. Install V4A app as system app (Put in /system/app/ and restart)

13. Why there is background noise when using V4A effects?
A: This is Android's MusicFX bug, this will happen on all other sound mods.
Suggestion: Backup and Delete /system/lib/soundfx/libbundlewrapper.so

14. Why bass reduced in v2.3.x?
A: Due to sound improvement, audio effects are more precise than before. Therefore, re-adjust your settings.

15. Why is volume reduced in v2.3.x?
A: Volume controlled to reduce noise level. (THIS does not mean you can reduce noise by lowering volume xD)

16. Why is there more CPU/Battery load in v2.3.x?
A: Quality improved for NEON devices. For now you cannot change to battery saving priority.

17. Why ViPER4Android FX/XHiFi always FC?
A: Uninstall and Reinstall V4A. If not submit bug.

18. Why ViPER4Android FX/XHiFi creates unexpected effects and different from other users?
A: Use Normal Mode and disable other sound mods such as Noozxoide. If not, reinstall.

19. ViPER4Android FX/XHiFi doesnt run after reboot?
A: Check anti-virus or any startup manager whether V4A is disabled on startup.

20. V4A FX/XHiFi effect gone after using data-killer?
A: Please add ViPER4Android FX/XHiFi to data-killer whitelist or exception.

21. V4A XHiFi effects gone after reaching certain volume? (~70%)
A: This is due to Sony Xperia hearing protection library.
Suggestion: Backup and Delete /system/lib/soundfx/libhearingprotection.so

22. Why volume reduces after 10 seconds?
A: This is not caused by V4A. Most probably you installed a bad and faulty xLOUD, ClearPhase or S-Force Front Surround port.

23. In-call volume reduced?
A: V4A will not affect call volume.

24. What if my phone/tablet cannot detect headset plugin?
A: Use lock effect mode and choose headset.

25. V4A effects will spoil internal speaker/headset?
A: Firstly, there's an audiophile limit in your phone, even if you max every single settings in V4A, u will never achive that limit.
If the limit is achieved, your ears will blown off before the headset.
If your earphone is not used to high volume/bass, with long period of high volume/bass will cause your headset to spoil (without V4A it will also spoil)
For speaker, if a new phone straight away max the volume, within few days there will be distortion. Start off with 50~70% volume and after some time only max the volume.