ViPER4Android Audio Effects Official (FX v2.5.0.5) – New Features & 7.0 Support


ViPER4Android Audio Effects

To ROM Makers who have already included or are considering including ViPER4Android in your ROM, please Click Here.

Please note that donations intended for ViPER4Android Development should not be sent to [email protected]. The V4A Project Donation account is not yet available.

On January 21, 2013, we discovered an Android PAID app that bears a striking resemblance to ViPER4Android. Based on the screenshots, it is undoubtedly a copy of our app. We are currently conducting an investigation into this paid app.

Sound Tweaks by APPZOS [Paid]….soundtweakpro

Sound Tweaks by APPZOS [Free]…ppz.soundtweak

Please do not mistake this above app as ViPER4Android. ViPER4Android is always free. Do not fall for this and do not buy it.

16 October 2013

Greetings, everyone!

To celebrate the launch of our website, we are pleased to announce the official release of ViPER4Windows. Visit the ViPER4Windows page for a detailed description and instructions.

You can access all ViPER-related content, including V4A, V4W, and IRS, on the download page.

12 October 2013

We invite you to register an account on our website and leave comments on our news and posts. Please note that registration is currently disabled, but we will provide an update when it becomes available. Cheers!

6 October 2013


  • Added v2.3.0.1 FAQ (OP#3)
  • Provided proper bug report instructions (OP#3)
  • Updated bug list (OP#3)
  • Revised troubleshooting for v2.3.0.1 (OP#3)
  • Updated General FAQ (OP#3)
  • Updated requirements for ROM makers (OP#5)
  • Updated OP index (OP#1)

30 September 2013

The entire OP (Original Post) has been updated from the 1st post to the 4th post. This includes instructions, changelogs, downloads, bug information, FAQs, troubleshooting, and explanations of settings and default configurations (replacing recommended settings).

20 September 2013

We are excited to announce that we have been featured on XDA Developer TV! Check out the quick review by Jimmy McGee’s Android App Review:…-developer-tv/

4 September 2013

We are thrilled to have joined the XDA-Developers Portal!…audio-effects/

Official Website


UNOFFICIAL V4A is available in Google Play Store. (Not maintained by us)…postcount=5689

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 fewer settings compared to FX. It has superior audio reconstruction which is 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 Customizable!) ★

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. It’s not very useful unless your headphone is an 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:…haas-effect-2/

★ ViPER Fidelity Control ★

★ ViPER Bass ★

With different bass modes, you can have a 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 a normal audio system, listening for more than three hours will feel fatigue, dizziness, tinnitus, irritation, 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 about 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 as 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 a 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 optimized 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, it’s 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:

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

Open Source at GitHub

If you want to commit codes, email [email protected] your git username.

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1 Comment

  1. Wow that was strange. I just wrote an incredibly long comment
    but after I clicked submit my comment didn’t show up.
    Grrrr… well I’m not writing all that over again. Anyways, just wanted to say excellent blog!

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