RootfulViPER4Android

RootfulViPER4Android (RootlessJamesDSP — ViPER4Android Edition) is a system-wide Android equalizer and audio effects app that brings the beloved ViPER4Android (V4A) sound experience to non-rooted phones. It combines the powerful open-source JamesDSP engine with native re-implementations of ViPER's classic effects — Dynamic System, ViPER Bass, ViPER Clarity, Spectrum Extension, Field Surround, Tube Simulator (6N1J) and many more — all running without root, without Magisk, and without custom ROMs.

Beyond the ViPER suite, it adds a fully reorderable DSP chain, so you decide the order every effect runs in, with the output limiter always kept last. An interactive parametric equalizer lets you drag bands directly on the response curve, add or remove them with a long press, and fine-tune frequency, Q and gain on rotary controls with full undo. A studio-grade echo/delay offers mono, stereo and ping-pong modes with a filtered feedback path, sample-rate and bit-depth crushing, tape-style modulation, diffusion and feedback distortion — all laid out on a knob panel that reflows to fit any screen. Up to four Liveprog (EEL2) scripts can be chained together and picked in one multi-select pass, and 446 official ViPER DDC profiles are bundled and ready to load.

The interface is yours to arrange: reorder, hide and group the effect cards, search across every effect, and save the whole setup — including your layout and chain order — into portable presets. Effect cards load as you scroll so the app opens instantly, and large effect buffers are allocated only while an effect is switched on, keeping memory use modest even with many apps playing audio. Processing also stands down on its own once playback goes quiet, so nothing is spent grinding through silence while your music is paused.

The Reverberation effect offers four rooms — the classic ViPER model plus a smooth studio Plate, a large warm Concert hall, and a natural Room with early reflections — and the output stage adds a ViPER classic limiter, a faithful re-creation of the original V4A limiter with the lookahead and transient bite that made it distinctive. The convolver and DDC libraries have their own search, custom sorting, hiding and groups, and can pull fresh impulse responses and DDC profiles straight from public repositories, skipping anything you already own.

Prefer the original experience? ViPER4Android-only mode narrows the app to the effects V4A shipped, using its naming, its processing order and its limiter, and switches everything else off so it costs nothing. A matching ViPER4Android classic theme is available on its own too, if you want the classic look without giving up any of the extras.

RootlessViPER4Android RootlessViPER4Android (RV4A) — a RootlessJamesDSP fork ViPER4Android effects natively ported to Android — no root required.

RootlessViPER4Android (RootlessJamesDSP — ViPER4Android Edition) is a system-wide Android equalizer and audio effects app that brings the beloved ViPER4Android (V4A) sound experience to non-rooted phones. It combines the powerful open-source JamesDSP engine with native re-implementations of ViPER's classic effects — Dynamic System, ViPER Bass, ViPER Clarity, Spectrum Extension, Field Surround, Tube Simulator (6N1J) and many more — all running without root, without Magisk, and without custom ROMs.

Beyond the ViPER suite, it adds a fully reorderable DSP chain, so you decide the order every effect runs in, with the output limiter always kept last. An interactive parametric equalizer lets you drag bands directly on the response curve, add or remove them with a long press, and fine-tune frequency, Q and gain on rotary controls with full undo. A studio-grade echo/delay offers mono, stereo and ping-pong modes with a filtered feedback path, sample-rate and bit-depth crushing, tape-style modulation, diffusion and feedback distortion — all laid out on a knob panel that reflows to fit any screen. Up to four Liveprog (EEL2) scripts can be chained together and picked in one multi-select pass, and 446 official ViPER DDC profiles are bundled and ready to load.

The interface is yours to arrange: reorder, hide and group the effect cards, search across every effect, and save the whole setup — including your layout and chain order — into portable presets. Effect cards load as you scroll so the app opens instantly, and large effect buffers are allocated only while an effect is switched on, keeping memory use modest even with many apps playing audio. Processing also stands down on its own once playback goes quiet, so nothing is spent grinding through silence while your music is paused.

The Reverberation effect offers four rooms — the classic ViPER model plus a smooth studio Plate, a large warm Concert hall, and a natural Room with early reflections — and the output stage adds a ViPER classic limiter, a faithful re-creation of the original V4A limiter with the lookahead and transient bite that made it distinctive. The convolver and DDC libraries have their own search, custom sorting, hiding and groups, and can pull fresh impulse responses and DDC profiles straight from public repositories, skipping anything you already own.

Prefer the original experience? ViPER4Android-only mode narrows the app to the effects V4A shipped, using its naming, its processing order and its limiter, and switches everything else off so it costs nothing. A matching ViPER4Android classic theme is available on its own too, if you want the classic look without giving up any of the extras.

ViPER effects & FIR EQ Output control & Bass exciter Surround, Dynamic system & Clarity ViPER effects and FIR equalizer Output control and dual-band bass exciter Surround, dynamic system and clarity sections

✨ Features

🐍 ViPER4Android effect suite (native ports) Arranged in the classic V4A order:

Effect What it does Playback gain control (AGC) Evens out quiet/loud tracks automatically FET compressor Punchy studio-style compression ViPER-DDC Headphone correction profiles — 446 official DDC files bundled! Spectrum extension Restores sparkle & air to compressed music FIR equalizer Precision fixed-band EQ Convolver Impulse response processing Field surround Widens the stereo field naturally Differential surround Classic V4A channel-delay surround Headphone surround + Speakers-in-a-room simulation for headphones Reverberation Full room reverb (size, damping, width, wet/dry) Dynamic system ViPER Dynamic Bass with all 19 original device presets + custom mode Tube simulator (6N1J) Warm analog tube saturation (up to 24 dB drive) ViPER bass Natural / Pure Bass+ / Subwoofer modes ViPER clarity Natural / OZone+ / XHiFi treble enhancement Auditory system protection (Cure+) Anti-fatigue crossfeed for long sessions Speaker optimization Corrective tuning for phone speakers

🎚 Plus the full JamesDSP toolkit Output limiter (with selectable peak / soft-saturation modes), auto-loudness compander, bass boost, dual-band psychoacoustic bass exciter, stereo widener, crossfeed, virtual room reverb, arbitrary-response graphic EQ (AutoEQ import), and a scriptable Liveprog (EEL2) engine.

💜 Quality-of-life Plain-language "ℹ️ what is this?" explainers on every section Smart UI: irrelevant sliders hide automatically Crash-safe DSP dispatch with built-in diagnostics Works per-app, session-based — no audio HAL patching

🆕 Added & changed vs. upstream RootlessJamesDSP

Added in this fork:

🐍 16 native ViPER4Android effect sections (see table above) — including brand-new engine code for Dynamic System, ViPER Bass, Clarity, FET Compressor, Cure+, Field/Differential/Headphone Surround, Reverberation, Spectrum Extension, AGC & Speaker Optimization 🔊 Dual-band psychoacoustic bass exciter — two independently tunable harmonic bands (the second band hides until you enable it) 🛡 Selectable output limiter modes: classic peak limiter, smooth soft-saturation (tanh) mode, or fully off 🎧 446 official ViPER-DDC correction files bundled and auto-installed on first launch ℹ️ Collapsible plain-language explainers on every effect section 🧰 Built-in crash diagnostics: native + JVM crash reports auto-copied to clipboard on next launch

Changed & fixed:

🔥 Tube simulator actually works now — upstream divided the drive value by 100 before it reached the engine (max ≈ 0.12 dB, inaudible); fixed and range extended to 24 dB 🐛 Fixed a crash when seekbars use a % unit label 🪄 Smart UI: Dynamic System custom sliders only appear in Custom mode; irrelevant controls stay hidden 🗂 All ViPER-equivalent sections renamed to their authentic V4A titles and reordered into the classic V4A layout under a dedicated header ➖ Removed the redundant Parametric EQ card (Arbitrary-response/graphic EQ covers it) 📛 App renamed to RootlessViPER4Android (installs alongside the original RootlessJamesDSP) 🆔 From v3.35.0 the package is this project's own — com.alienware377.viper4android.rootless, and com.alienware377.viper4android.rootful for the rooted build. Earlier releases still carried upstream's me.timschneeberger.rootlessjamesdsp, which this fork stopped being a long time ago. The rooted build is now called RootfulViPER4Android rather than confusingly shipping "Rootless" in its own name