Tonebox — Equalizer & DSP

Tonebox is a precise, system-wide audio equalizer and dynamics processor built on Android's native DynamicsProcessing engine. Shape the sound of any app — music, video, games, podcasts — across your speaker, wired headphones, or Bluetooth.

No bloat. No ads. No accounts. Just clean, powerful audio control.

━━━━━━━━━━━━━━━━━━
PARAMETRIC EQUALIZER
━━━━━━━━━━━━━━━━━━
• 8 fully adjustable bands
• Filter types: Bell, Low/High Shelf, Low/High Pass, Notch, Band Pass
• Drag points directly on the response curve
• Three views: Parametric curve, Graphic sliders, and a precise Table editor
• Per-band frequency, gain, and Q control

━━━━━━━━━━━━━━━━━━
DYNAMICS PROCESSING
━━━━━━━━━━━━━━━━━━
• 3-band multiband compressor (Low / Mid / High)
• Per-channel peak limiter to prevent clipping
• Adjustable crossover frequencies

━━━━━━━━━━━━━━━━━━
SMART FEATURES
━━━━━━━━━━━━━━━━━━
• Auto-Preamp: loudness-matched gain so toggling EQ doesn't change perceived volume
• Per-device presets: bind a preset to a headphone or speaker, and it switches automatically when that device connects
• Live spectrum visualizer
• Quick Settings tile to toggle EQ from anywhere
• Import AutoEQ / Equalizer APO preset files
• 9 built-in presets (Bass Heavy, Vocal Boost, Rock, Electronic, and more)
• Save unlimited custom presets

━━━━━━━━━━━━━━━━━━
PRIVATE BY DESIGN
━━━━━━━━━━━━━━━━━━
• 100% on-device processing
• No data collection, no analytics, no ads, no network access
• Open about every permission it uses

Tonebox requires Android 9 (Pie) or newer.

Note: System-wide audio effects depend on your device's audio hardware. Some manufacturers restrict third-party audio processing; behavior may vary by device.

Recent changes:
Stability & bug-fix update:

• Fixed crashes on startup that some devices hit — the app now opens reliably everywhere.
• Fixed the equalizer turning off when changing songs.
• Improved compatibility with the latest Android.

Thanks for all your reviews and feedback — keep them coming!