[APP] Official ViPER4Android Audio Effects (FX v2.5.0.5) - New Features & 7.0 Support

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By zhuhang, Recognized Contributor on 15th March 2013, 04:42 AM
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If you want to share at another forum, do not include download links, redirect them to download here.

To ROM Makers who already included or wish to include V4A in your ROM. Click HERE.

Donations intended for V4A Development, please DO NOT send to [email protected]
V4A Project Donation account not available yet.

Sticky News
Development Progress: Inactive
Past events:
21 Jan 2013 (Alert - Illegal V4A Theft / V4A Clone)
Recently, we found an android PAID app very similar to ViPER4Android.
Judging by the screenshots, its definitely a copy of our app.
We will do an investigation on this following paid app.
Sound Tweaks by APPZOS [Paid]

Sound Tweaks by APPZOS [Free]
Please do not mistaken this above app as V4A. ViPER4Android is always free. Do not fall for this and do not buy it.

Help to share this post to alert others.

16 October 2013
Hello everyone!

Now, our website is ready! You can now register as a subscriber here.

Celebrating the launch of our website, ViPER4Windows also officially released.
Head over to ViPER4Windows page for description and instructions.

You can download all ViPER related contents at downloads page. This includes the V4A, V4W and IRS at the moment.

12 October 2013
Our English website is in progress. Its a wordpress based website. Its up, but not ready with posts. We'd be very busy lately so we do not have time to write pages and posts.
Here's the link:

You can register an account at our website and make comments on our news and posts there. Right now, registration is disabled. We will make announcement when its ready. Cheers.

6 October 2013
- Added v2.3.0.1 FAQ (OP#3)
- Added proper bug report instructions (OP#3)
- Updated bug list (OP#3)
- Updated troubleshooting for v2.3.0.1 (OP#3)
- Updated General FAQ (OP#3)
- Updated requirement for Rom makers (OP#5)
- Updated OP index (OP#1)

30 September 2013
Whole OP Updated from 1st post to 4th post.
Instructions, Change logs, Downloads, Bugs, FAQ, Troubleshoot, Settings explained, default settings (replace recommended settings)

20 September 2013
This time, we are on XDA Developer TV!
A very nice quick review right here by Jimmy McGee's Android App Review.

4 September 2013
We finally made our way to the XDA-Developers Portal!!
Hoooray!! Million thanks to the news writer.
Official Website
ViPER's Audio Official Website:
ViPER's Audio Official Chinese Forum:

Like our Facebook Page here! >>>
Join ViPER's Audio Facebook Group here! >>>
ViPER's Audio Global QQ Group:

UNOFFICIAL V4A available in Google Play Store. (Not maintained by us)

OP Index:
1. About Us // Description // Key Features // Development Progress // Donations // Open source
2. Instructions // CPU Driver List // Change Logs // Downloads
3. Bug list // Proper Bug report // Troubleshooting // FAQs
4. V4A Profiles // Popular effect simulation profiles // FX and XHiFi Settings Explained // Default V4A settings
5. For ROM makers
6. Signatures // Userbar // Banners

Vipers Audio
About ViPER's Audio
See here:

Software Descriptions
Version: FX version (active) / XHiFi version (discontinued)
Codename: (FX version) Beautiful / (XHiFi version) X-Factor
Compiled date: September 1,2016 / September 4,2013 - Official Release
Operating environment: Android 2.3 / 4.0 / 4.1 / 4.2 / 4.3 / 4.4 / 5.0 / 6.0 / 7.0
CPU platforms: ARM (ARM CortexA8 or higher), x86(Atom/i3/i5/i7)
Language: English (US) / Simplified Chinese / Traditional Chinese / more

ViPER4Android FX
FX is the main control panel of ViPER’s Audio with all popular ViPER’s Audio settings.

ViPER4Android XHiFi (Stopped)
XHiFi has less settings compare to FX. It has superior audio reconstruction which mainly used for restoring lossy audio quality.

FX Key Features
★ NEW: FET Compressor ★
New compressor / limiter simulating operation of FET circuits.

★ NEW: Quad-Channel Convolver ★
IRS support extends to 4-channels. *Requires special IRS files*

★ AnalogX ★
Richer and warmer sound by simulating the sound signature of pure class A amplifier. *v2.4.x and above+*

★ ViPER-DDC (Now Cuztomizable!) ★
Enjoy near HIFI sound on your headphones. *Not all models supported*

★ Spectrum Extension ★
Make your music sound lossless with enhanced high frequencies.

★ x86 Platform Support ★
Viper4Android supports x86 (Atom/Core i3/i5/i7) platforms.

★ USB/Dock effect Support ★
ViPER4Android supports USB/Dock audio output.

★ Speaker Optimization ★
First effect for speakers. Try it yourself.

★ Channel Pan ★
Controls left/right channel output. Its not very useful unless your headphone is imbalance or faulty one side. It will be a cure for you.

★ Differential Surround / Haas Effect ★
This is an old feature which ViPER520 had removed from FX in early days.
But after many users requesting it, ViPER520 bring it back to FX
More info on Haas Effect:

★ ViPER Fidelity Control ★
★ ViPER Bass ★
With different bass modes, you can have greater bass experience than before!
★ ViPER Clarity ★
With the latest Clarity mode selection, you can balance up heavy bass with high clarity audio that you can never imagine before!

★ Headphone Surround+ (VHS+) ★
With this VHS+, V4A made its way to achieve great surround technologies for Android.

★ Auditory System Protection (Cure Tech+) ★
With normal audio system, listening for more than three hours will feel fatigue, dizzy, tinnitus, irritated and other symptoms.
This is a normal reaction, heavy bass and high volume could cause permanent damage to the human auditory system, but other phenomena can restore through resting.
Viper as a listening experience professional will not ignore this problem. Therefore put a lot of effort to study how to make a "Healing" sound technology, just a small success. But thinking on how to let users experience it.

★ Convolver ★
When an Impulse Response Sample(IRS) is loaded, V4A will process the sound to show the same characteristics of the loaded sample. Through Convolution, samples with effects such as equalizer, surround, reverberation, tube etc can be loaded.
Download and extract IRS files to <storage>/ViPER4Android/Kernel/<paste files here>

★ FX Compatible Mode (Only in 4.x) ★
Compatible Mode supports large variety of music players and the players' own EQ/sound effects (system-provided/third party)
Therefore, you don't have to select V4A in Sound Settings > Music Effects, choose anything other than V4A. Just run V4A app and the effects will be working with anything else.

1. In option, switch to Compatible Mode. Reboot, done.
2. In Sound Settings > Music Effects, choose other than V4A.
3. Run V4A app and configure the settings then the effects will work together with the one you chose in Sound Settings.

Last Update Log
Note: FX v2.3.2.5 onwards:
1. Fully support x86 platform, but not fully optimised yet. (Using VHS+/Convolver may increase battery usage)
2. Fully support true octa-core devices.
3. Correctly-installed Busybox is required before installing V4A.

If you see V4A installation pop-up loop, its probably due to incomplete root OR htc_audio_effects.conf
FX version: v2.5.0.5 (New package name! Please uninstall any previous version)
Android 7.0 Nougat users >>>> Try this fix apk: here.
!! Detailed update info >>> Read Joe's post: here.
0. Emergency fix v2504 - repair load file incompatibility issues.
1. New UI.
2.Add quad-ch convolver support (stereo convolver).
3.Add FET compressor.
4.Support change storage path.
5.Fix bugs.
XHiFi version: Final v2.1.0.2-1 (discontinued)
1.Support for Android 4.3 (v2102-1)
2.No changes for Android 2.3 (2102)
Full download list at Official Website:
Note: Please connect to the internet when installing V4A. So we can count our users.
ViPER4Android FX
v2.5.0.5 (Android 4.0~7.0): Mediafire *ZIP Contains v2505 standard & v2505 nougat IO fix apk*
v2.4.0.1 (Android 4.0~6.0): Mediafire *Does't support below Android 4.0*
v2.3.4.0 (Android 2.3~5.0): Mediafire

ViPERsToolBox(For making custom DDC))
v2.0: Mediafire
v0.1: Dropbox (Joe)

ViPER4Android XHiFi
XHiFi version Final v2.1.0.2-1 (Android 2.3~4.3): Mediafire
IRS Impulse Response Sample
Official Website:

IRS Index: here
Zhuhang's IRS XDA: here
Joe0Bloggs Headset Correction Filter IRS: here
V4A Project Donation account not available yet.
Visit here:
Open Source at GitHub
If you want to commit codes, email [email protected] your git username.
ViPER's Audio founded by ViPER520.
Co-founded by ZhuHang.
CN. / EN.
Copyright (C) 2006-2017 /
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Installation / Downloads
Check this post for complete tips, instructions, notes and warnings.

v2.2.x to v2.3.x Special Update Instructions
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.
Setup your Device
For Samsung devices,
1. Try install V4A as user app instead of system app if the latter failed doesn't work.
2. Use Normal Mode and select V4A FX in Settings>Sound>Music Effects.
3. If don't work, use another player rather than Samsung stock Music.
1. ROOT your device.
2. Install busybox if doesn’t come with root.
3. Modify build.prop (Thanks [email protected])
a. Open up /system/build.prop in text editor using any file explorer with root access.
b. Change the line (If you can’t find these lines, skip this step.)
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.
Future Updates
Option 1: Use the “Check for update” function in V4A app itself.
1. In V4A app, go to menu and select Check Update. It will redirect you to a page.
2. Download latest apk from the page.
3. Install apk and overwrite. (Replace in system/app/ if its SYSTEM app)
4. Open up FX (and XHIFI), Choose “Yes”. Reboot, done.

Option 2: Download from Website/XDA
1. Download latest FX and XHIFI apks from Website’s Downloads section or XDA.
2. Install apk and overwrite. (Replace in system/app/ if its SYSTEM app)
3. Open up FX (and XHIFI), Choose “Yes”. Reboot, done.

1. Open up V4A FX (and xhifi), go to menu and choose “Uninstall driver”.
2. After that, uninstall V4A FX (and xhifi) app itself.
3. Reboot. Done. Bye-bye V4A.

ViPER's Audio founded by ViPER520.
Co-founded by ZhuHang.
CN. / EN.
Copyright (C) 2006-2016 /
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Troubleshoot / Bugs / F.A.Q
Check previous post for complete tips, instructions, notes and warnings.

Bug Report

Troubleshooting (Updated 20/10/2013)
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).
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.
Updated on October 22, 2013
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/

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/

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.
ViPER's Audio founded by ViPER520.
Co-founded by ZhuHang.
CN. / EN.
Copyright (C) 2006-2016 /
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FX & XHiFi Settings Explained & Default Settings
V4A Profiles

Popular Effect Simulation Profiles (Updated 1/10/2013)
These setup will sound almost the same compare to original effect.
1. Dolby System 2.0 (DS2.0) (FX v2.3.0.1)
- AGC, slight, 4x, 0db
- VHS+, level 3
- field surround, strength level 7, mid level 5
- viperclarity, xhifi mode, default
V4A Settings Explained

ViPER's Audio founded by ViPER520.
Co-founded by ZhuHang.
CN. / EN.
Copyright (C) 2006-2016 /
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