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

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mssam

Senior Member
Feb 10, 2012
757
181
Hello all…would someone who has xhifi installed and working properly with lollipop be willing to give me a helping hand? I’m trying to get it working with a 5.1 rom on a n7 2013. At some point I had it installed and working, but can't remember for the life of me what I did to get it working. Like so many others users have seen, it installs then gives me the ol’ “driver failed blah blah” prompt and of course the latest busybox, supersu and selinux (permissive) are installed. Tried a folder with permissions set in the system/priv-app folder, but nada. Tried just the apk in the system/app folder with permissions set, but nada again. I read some posts where users said they had it working with lollipop, so of you have xhifi working would you mind throwing out a couple of suggestions to give me a helping hand? Thx gals & gents!.. ?
 

GiRaFa-SAMA

Senior Member
Jan 1, 2013
391
94
Belo Horizonte
Hello all…would someone who has xhifi installed and working properly with lollipop be willing to give me a helping hand? I’m trying to get it working with a 5.1 rom on a n7 2013. At some point I had it installed and working, but can't remember for the life of me what I did to get it working. Like so many others users have seen, it installs then gives me the ol’ “driver failed blah blah” prompt and of course the latest busybox, supersu and selinux (permissive) are installed. Tried a folder with permissions set in the system/priv-app folder, but nada. Tried just the apk in the system/app folder with permissions set, but nada again. I read some posts where users said they had it working with lollipop, so of you have xhifi working would you mind throwing out a couple of suggestions to give me a helping hand? Thx gals & gents!.. ?
You are Brazilian? I am Brazilian.

I installed both programs (FX and XHiFi) first, I created a folder called ViPER4Android FX in System / App / ViPER4Android FX I configured the correct permissions on the folder, and soon after pasted the ViPER4Android FX apk and I configured the permissions on System / App / ViPER4Android. Then I went into System / priv-app and pasted the ViPER4Android XHiFi and I configured the permissions of a normal apk. Soon after, I restarted my device(both applications will appear on your app drawer after reboot) (signature) and installed the driver ViPER4Android XHiFi, rebooted again and installed ViPER4Android XHiFi. Both work, but the ViPER4Android XHiFi is no longer updated, and the chance of working in higher versions is very small right now. Sorry for my English, was translated using Google Translate.

Portuguese:

Eu instalei ambos os programas (FX e XHiFi) primeiramente, eu criei uma pasta chamada ViPER4Android FX em System/App/ViPER4Android FX setei as permissões corretas na pasta, e logo após colei o ViPER4Android FX apk e setei as permissões em System/App/ViPER4Android. Depois fui em System/priv-app e colei o ViPER4Android XHiFi e setei as permissões de um apk normal. Logo depois, reiniciei o meu dispositivo (assinatura) e instalei o driver do ViPER4Android XHiFi, reiniciei novamente e instalei o ViPER4Android XHiFi. No momento os dois funcionam, mas o ViPER4Android XHiFi não é mais atualizado, e as chances de funcionar em versões superiores é bem pequena. Desculpe pelo meu inglês, foi traduzido usando o Google Tradutor.

Enviado do meu Galaxy S4 GT-i9505 usando Tapatalk
 
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zyclops1

Senior Member
Jan 25, 2012
754
136
Paris
Hello! Can anyone help to solve this?
Drivers instilling without any problem.

-Sony Xperia Z1 LP 5.0.2
 

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AuSSiELaMbChOpS

Senior Member
May 27, 2012
433
1,270
github.com
Hello! Can anyone help to solve this?
Drivers instilling without any problem.

-Sony Xperia Z1 LP 5.0.2
Covered many times in the thread, try the following:
1. Set SELinux mode to permissive
2. Disable NuPlayer in Settings, Developer Options.

This made v4a work perfectly on my Xperia Z running cm12 (5.0.2).

Sent from my Sony Xperia™ Z using Tapatalk
 

rraaka

Senior Member
Sep 8, 2010
2,608
671
You are Brazilian? I am Brazilian.

I installed both programs (FX and XHiFi) first, I created a folder called ViPER4Android FX in System / App / ViPER4Android FX I configured the correct permissions on the folder, and soon after pasted the ViPER4Android FX apk and I configured the permissions on System / App / ViPER4Android. Then I went into System / priv-app and pasted the ViPER4Android XHiFi and I configured the permissions of a normal apk. Soon after, I restarted my device(both applications will appear on your app drawer after reboot) (signature) and installed the driver ViPER4Android XHiFi, rebooted again and installed ViPER4Android XHiFi. Both work, but the ViPER4Android XHiFi is no longer updated, and the chance of working in higher versions is very small right now. Sorry for my English, was translated using Google Translate.



Enviado do meu Galaxy S4 GT-i9505 usando Tapatalk

whats the advantage of having both the apps installed please ?
 

stueycaster

Senior Member
Aug 19, 2011
2,804
993
Indianapolis
I was in here a few days ago pulling my hair out trying to get Viper to work. Thanks to those who tried to help. The thing that fixed it was a custom kernel for my Verizon Note 4. It's all good now. Later. :)

Sent from my SM-N910V DE
 

GiRaFa-SAMA

Senior Member
Jan 1, 2013
391
94
Belo Horizonte
whats the advantage of having both the apps installed please ?
Android default process audio in 16bit format, ViPER4Android XHiFi process audio in 32 bit, and have a awesome feature called Audio Reconstruction, Which greatly improves the clarity and bass of your music.

I recommend to use on ViPER4Android XHiFi on the Fire Equalizer the acoustic or vocal bass profile.

Enviado do meu Galaxy S4 GT-i9505 usando Tapatalk
 

vanzant83

Senior Member
Apr 9, 2015
65
3
Forlì
Hello guys i need some help, i'm trying to installing this app from age but without result...i have a mate 7, all seem fine, i choose the 4 version, driver are installed, busybox is installed, both busybox and V4A have superSU permission. What can i do? the app start normally but the sound is not processed at all. I tried also to install v4a as a system app as suggest in the troubleshooting advices. THere's still a doubt in the troubleshooting guide, there's a line that say "Use Normal mode, go to Sound settings>Music effects> and choose V4A(either fx or xhifi).>>>Test." but in mate7 there's no music effects at all in the audio settings, or nothing about any equalizer.
i have all stock with a root made with superSU and CWM, mate7 run a 4.4.2 kitkat
 
Last edited:

Exile1975

Senior Member
Dec 3, 2011
281
95
Hello guys i need some help, i'm trying to installing this app from age but without result...i have a mate 7, all seem fine, i choose the 4 version, driver are installed, busybox is installed, both busybox and V4A have superSU permission. What can i do? the app start normally but the sound is not processed at all. I tried also to install v4a as a system app as suggest in the troubleshooting advices. THere's still a doubt in the troubleshooting guide, there's a line that say "Use Normal mode, go to Sound settings>Music effects> and choose V4A(either fx or xhifi).>>>Test." but in mate7 there's no music effects at all in the audio settings, or nothing about any equalizer.
i have all stock with a root made with superSU and CWM, mate7 run a 4.4.2 kitkat
Did you edit your build.prop? If not read the directions again and try editing your build.prop.
 

Exile1975

Senior Member
Dec 3, 2011
281
95
where i supposed to add... i mean, there are tons of lines and it seem divided in a specific order..and anyway are you sure to not mess up something?
I'm assuming since you have root and recovery you have a backup? Just add them at the bottom of your build.prop, be sure to leave an empty line after your additions. Then reboot. If you open play music, go to settings, then select equalizer, it should open viper. Let me know
 

vanzant83

Senior Member
Apr 9, 2015
65
3
Forlì
I'm assuming since you have root and recovery you have a backup? Just add them at the bottom of your build.prop, be sure to leave an empty line after your additions. Then reboot. If you open play music, go to settings, then select equalizer, it should open viper. Let me know

i guess i have the basic backup of huawei, but i don't have titanium, maybe i should have that. i'm new in the modding world so i guess it will take a bit
 

Exile1975

Senior Member
Dec 3, 2011
281
95
i guess i have the basic backup of huawei, but i don't have titanium, maybe i should have that. i'm new in the modding world so i guess it will take a bit
Wait, you said you have CWM installed right? That's the recovery I mean. Boot into it and make a backup. That way if anything goes bad you bit back into recovery and restore that. Maybe you just need to do a lot more reading on root, recovery, and what they are for and do.
 

vanzant83

Senior Member
Apr 9, 2015
65
3
Forlì
I'm assuming since you have root and recovery you have a backup? Just add them at the bottom of your build.prop, be sure to leave an empty line after your additions. Then reboot. If you open play music, go to settings, then select equalizer, it should open viper. Let me know

This way? Before save it ask me those 3 options..i madre the backup through the cwm as you said anyway
 

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Tried it on my Galaxy S5 AT&T. Did not work.

Checked build.prop, no settings found. Driver Status:
Driver Version: 2.3.4.0
NEON Enabled: No
Enabled: No
Status: Abnormal
Audio Format: Unsupported
Processing: No
Sampling Rate: 0

Using AT&T's Lollipop (Android 5.0). Rooted, BusyBox.

---------- Post added at 02:47 PM ---------- Previous post was at 02:33 PM ----------

Tried it on my Galaxy S5 AT&T. Did not work.

Checked build.prop, no settings found. Driver Status:
Driver Version: 2.3.4.0
NEON Enabled: No
Enabled: No
Status: Abnormal
Audio Format: Unsupported
Processing: No
Sampling Rate: 0

Using AT&T's Lollipop (Android 5.0). Rooted, BusyBox.

Never mind. Changing SELinux to permissive is not the right answer for me.
 

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  • 1
    anyway, tried V4a using methods below

    • Install v4a directly from magisk, v4a not working
    • Take the zip and install v4a from recovery (i use official orangefox) and again v4a not appear after flashed
    • Install v4a zip from recovery + install from magisk, v4a appear on device but not working too
    • Legacy and compatibility mode activated, v4a not working

    Tested on Poco M3 and Redmi Note 9 pro.
    both device using official PixelPlusUI running android 11.
    ...snip...
    The attachment to this post, installed as/via magisk module, works for me and all I have seen that have tried it under A11.

    I havent read all your post, but I would start with cleaning all you have done before. ie magisk modules and installed apps.
  • 3677
    [APP] Official ViPER4Android Audio Effects (FX v2.5.0.5) - New Features & 7.0 Support

    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
    Remarks:-
    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.


    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: http://www.vipersaudio.com/blog

    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.
    http://www.xda-developers.com/andro...-deserve-with-viper4android-xda-developer-tv/

    4 September 2013
    We finally made our way to the XDA-Developers Portal!!
    Hoooray!! Million thanks to the news writer. ;)
    http://www.xda-developers.com/android/tweak-your-mobile-audio-with-viper4android-audio-effects/

    Official Website
    ViPER's Audio Official Website: http://www.vipersaudio.com/blog
    ViPER's Audio Official Chinese Forum: http://forum.vipersaudio.com/

    Social
    Like our Facebook Page here! >>> https://www.facebook.com/vipersaudio
    Join ViPER's Audio Facebook Group here! >>> https://facebook.com/groups/vipersaudio.en/
    ViPER's Audio Global QQ Group: http://forum.xda-developers.com/showpost.php?p=44506830&postcount=4586

    UNOFFICIAL V4A available in Google Play Store. (Not maintained by us)
    http://forum.xda-developers.com/showpost.php?p=45217407&postcount=5689

    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

    va-official3.png

    About ViPER's Audio
    See here: http://vipersaudio.com/blog/?page_id=11

    Software Descriptions
    Version: FX version 2.5.0.5 (active) / XHiFi version 2.1.0.2-1 (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: http://www.mixcoach.com/creating-depth-the-haas-effect-2/


    ★ 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)​

    Downloads
    Full download list at Official Website: http://vipersaudio.com/blog/?page_id=48
    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: http://vipersaudio.com/blog/?page_id=91

    XDA:
    IRS Index: here
    Zhuhang's IRS XDA: here
    Joe0Bloggs Headset Correction Filter IRS: here

    Donations
    V4A Project Donation account not available yet.
    Visit here: http://vipersaudio.com/blog/?page_id=180

    Open Source at GitHub

    ------------------------------------------
    ViPER's Audio founded by ViPER520.
    Co-founded by ZhuHang.
    CN. vipersaudio.com / EN. facebook.com/vipersaudio
    Copyright (C) 2006-2017 vipercn.com / vipersaudio.com
    1116
    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

    Installation
    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.


    Uninstallation
    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. vipersaudio.com / EN. facebook.com/vipersaudio
    Copyright (C) 2006-2016 vipercn.com / vipersaudio.com
    637
    Troubleshoot / Bugs / F.A.Q

    Check previous post for complete tips, instructions, notes and warnings.

    Bug Report
    http://vipersaudio.com/blog/?page_id=120

    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).
    >>>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.​

    F.A.Q
    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/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.

    -----------------------------
    ViPER's Audio founded by ViPER520.
    Co-founded by ZhuHang.
    CN. vipersaudio.com / EN. facebook.com/vipersaudio
    Copyright (C) 2006-2016 vipercn.com / vipersaudio.com
    554
    FX & XHiFi Settings Explained & Default Settings

    V4A Profiles
    http://forum.xda-developers.com/showpost.php?p=44577409&postcount=4642

    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
    http://vipersaudio.com/blog/?page_id=43

    -----------------------------
    ViPER's Audio founded by ViPER520.
    Co-founded by ZhuHang.
    CN. vipersaudio.com / EN. facebook.com/vipersaudio
    Copyright (C) 2006-2016 vipercn.com / vipersaudio.com
    422
    For ROM Makers

    V4A Rom Inclusion
    Website(Down): http://vipersaudio.com/blog/?page_id=127


    Things you need to do
    1. Proper credits to ViPER520.
    2. Add a link to ViPER’s Audio Website. (Its obvious because users need so many info here)
    3. Please remind users to use “Compatible Mode” if you inserted other sound mods.
    4. [OPTIONAL] Attach latest IRS Starter Pack as add-on/optional material for users to start with.


    Extra Tips
    1. Make it a system app.
    2. Copy assets/libv4a_fx/xhifi_xxx.so to /system/lib/soundfx/
    Note: xxx can be gb for 2.3.x, ics for 4.0~4.2 or jb for 4.3
    3. For android 2.3, done. For android 4.x, continue step 4.
    4. Make modification in audio_effect.conf
    (1). Under “libraries {“, add:
    Code:
     v4a_fx {
              path /system/lib/soundfx/libv4a_fx_xxx.so
            }
    #NECESSARY FOR XHIFI
            v4a_xhifi {
              path /system/lib/soundfx/libv4a_xhifi_xxx.so
            }

    (2). Under “effects {“ add:
    Code:
            v4a_standard_fx {
              library v4a_fx
              uuid 41d3c987-e6cf-11e3-a88a-11aba5d5c51b
            }
    #NECESSARY FOR XHIFI
            v4a_standard_xhifi {
              library v4a_xhifi
              uuid d92c3a90-3e26-11e2-a25f-0800200c9a66
            }

    Thanks for promoting ViPER4Android!
    -----------------------------
    ViPER's Audio founded by ViPER520.
    Co-founded by ZhuHang.
    CN. vipersaudio.com / EN. facebook.com/vipersaudio
    Copyright (C) 2006-2016 vipercn.com / vipersaudio.com