Peaks EN

Peaks — Browser Audio Equalizer

A high-precision, 11-band audio equalizer and mastering suite that works across all websites — YouTube, Spotify Web, SoundCloud, Twitch, and anywhere else audio plays in your browser.

What It Does

Peaks intercepts your browser's Web Audio engine and wraps every audio source in a full DSP processing chain — giving you studio-grade control over how everything sounds, in real time.

No page reloads. No account. No cloud. Just better sound.

Features

11-Band Equalizer

Drag the vertical sliders to boost or cut any frequency band. Each band can also be switched to a different filter type by clicking the label above it.

| Band | Frequency | Default Type |
|------|-----------|--------------|
| 1 | 30 Hz | Low Shelf |
| 2 | 60 Hz | Low Shelf |
| 3 | 120 Hz | Peaking |
| 4 | 250 Hz | Peaking |
| 5 | 500 Hz | Peaking |
| 6 | 1 kHz | Peaking |
| 7 | 2 kHz | Peaking |
| 8 | 4 kHz | Peaking |
| 9 | 8 kHz | Peaking |
| 10 | 12 kHz | High Shelf |
| 11 | 16 kHz | High Shelf |

Available filter types: Peaking, Low Shelf, High Shelf, Low Pass, High Pass, Band Pass

Solo Bands

Click the S button on any band to isolate it. You can solo multiple bands at once. Soloed bands pulse red so you always know what's active.

EQ & Filter Dials

| Dial | What It Does |
|------|-------------|
| High Pass | Cuts everything below the set frequency |
| Low Pass | Cuts everything above the set frequency |
| Presence | Boosts/cuts the 3.2 kHz vocal clarity region |
| Air | Boosts/cuts the 12 kHz high shelf — adds "air" and openness |
| Brilliance | Boosts/cuts the 8 kHz presence peak — adds sparkle |

Dynamics Dials

| Dial | What It Does |
|------|-------------|
| Preamp | Volume multiplier before the EQ chain (0× mute → 2× loud) |
| Compressor | Threshold-based dynamic compression — glues the mix |
| Limiter | Brickwall ceiling — prevents any distortion or clipping |
| Transient | Positive = Punch (snappy, forward hits) · Negative = Soft (smooth, rounded) |

Space & Pan Dials

| Dial | What It Does |
|------|-------------|
| Width | Stereo width via Mid-Side matrix (0% = Mono → 200% = Super Wide) |
| Pan | Left/Right stereo panning |
| Reverb Dry | Level of the original (direct) signal |
| Reverb Wet | Level of the synthetic room reverb tail |

Real-Time Visualizer

The frequency response curve updates live while audio plays, showing you the combined shape of all your EQ adjustments on top of the band sliders.

Preset System

• 9 built-in presets — Flat, Bass Booster, Bass Reducer, Vocal Booster, Treble Booster, Acoustic, Electronic, Rock, Classical
• Custom presets — Save your own with any name. If the name already exists, you'll be asked if you want to overwrite it
• Delete any custom preset with the trash icon (only visible when a custom preset is active)

DSP Signal Chain

Audio flows through this chain in order:

Source Audio
│
▼
11-Band EQ Filters (BiquadFilterNode × 11)
│
▼
Dial Filters — High Pass · Low Pass · Presence · Air · Brilliance
│
▼
Multi-Solo Router (parallel bandpass isolation)
│
▼
Transient Shaper (DynamicsCompressorNode — attack/sustain control)
│
▼
Compressor (DynamicsCompressorNode — glue compression)
│
▼
Mid-Side Stereo Widener (ChannelSplitter/Merger matrix)
│
▼
Stereo Panner (StereoPannerNode)
│
▼
Reverb (ConvolverNode — synthetic studio room, parallel dry/wet)
│
▼
Brickwall Limiter (DynamicsCompressorNode — 20:1 ratio, hard knee)
│
▼
Analyser (AnalyserNode — feeds real-time visualizer)
│
▼
Output


Browser Compatibility

| Browser | Support |
|---------|---------|
| Google Chrome | ✅ Full |
| Microsoft Edge | ✅ Full |
| Firefox | ✅ Full (via chrome.* compatibility shim) |
| Opera | ✅ Full (Chromium-based) |
| Brave | ✅ Full (Chromium-based) |

Installation (Manual / Developer Mode)

1. Download or clone this repository
2. Open your browser's extensions page:
3. Chrome / Edge / Opera / Brave → chrome://extensions
4. Firefox → about:debugging → This Firefox → Load Temporary Add-on
5. Enable Developer Mode (toggle in the top-right corner)
6. Click Load unpacked and select the Peaks folder
7. The Peaks icon will appear in your browser toolbar

Project Structure

Peaks/
├── manifest.json ← Extension manifest (Manifest V3)
│
├── popup/
│ ├── popup.html ← Extension popup UI
│ ├── popup.css ← Styles (dark glassmorphic theme)
│ └── popup.js ← Popup controller — UI, presets, visualizer
│
├── scripts/
│ ├── content-main.js ← Main-world audio DSP engine (hooks Web Audio API)
│ ├── content-bridge.js ← Isolated-world bridge (relays messages to main world)
│ ├── background.js ← Service worker (loads settings, relays to content scripts)
│ └── content.js ← Lightweight content entry point
│
├── icons/
│ ├── icon-16.png ← Toolbar icon
│ ├── icon-48.png ← Extensions page icon
│ ├── icon-128.png ← Store / install icon
│ └── peaks_source.png ← Master source icon (high-res)
│
└── developer/
└── generator.html ← Tool to rasterize icons from source PNG


How It Intercepts Audio

Peaks runs in the MAIN world of the page (same JavaScript context as the website). It monkey-patches AudioContext and AudioNode.prototype.connect so that any audio node trying to connect to the speakers is silently rerouted through the EQ chain first. The website never knows anything changed.

It also scans for <video> and <audio>…