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Those tracks are protected by digital rights management (DRM) — typically songs from a streaming subscription. No app on iPhone, iPad or Mac can apply audio effects to DRM-protected content. They still play normally, just without effects. Songs you import and DRM-free tracks in your library get the full equalizer.

iPhone and iPad: open the Library tab and tap Import. You can pick audio files (MP3, M4A, WAV, FLAC and more) from the Files app — including iCloud Drive and other storage providers — or receive them via AirDrop and open them in the App.

Mac: open the Library tab and click Import (or press ⌘I), or simply drag audio files from Finder onto the Library. Imported songs show their embedded cover art, title and artist on every platform.

Yes — Equalizer runs natively on Mac (macOS 14 Sonoma or later), and one Premium subscription covers iPhone, iPad and Mac. Sign in to the App Store on your Mac with the same Apple ID, open Equalizer and choose Settings → Restore purchases if Premium doesn't appear straight away. The Mac version shows no ads.

• Music: the Mac version plays the files you import; it doesn't read the Music app's library.
• Keyboard: Space plays/pauses, ⌘→ / ⌘← skip tracks, and your keyboard's media keys work too. The same commands are in the Controls menu.
• Favorites and deleting: right-click a song in the Library.
• Output device: choose speakers or headphones in macOS System Settings → Sound; the route chip in the player opens it for you. Per-device presets apply automatically when the output changes.
• Ads: none.

Open Settings → Restore purchases inside the App (also available on the paywall). Make sure you're signed in with the same Apple ID that made the purchase. If it still doesn't restore, email us with your approximate purchase date.

Subscriptions are managed by Apple. On iPhone or iPad, open Settings → your name → Subscriptions → Equalizer and tap Cancel. On Mac, open the App Store → click your name → Account Settings → Subscriptions → Manage. You keep Premium until the end of the paid period. The App's Settings → Manage subscription row takes you there directly. Refund requests go through reportaproblem.apple.com.

Check three things: the device rule's auto-apply toggle is on (Settings → Device presets), the App is running, and the device name matches (renamed Bluetooth devices create a new entry — assign the preset again). Auto-apply is a Premium feature.

That's the built-in limiter protecting the sound. When boost pushes audio near clipping, the limiter transparently reduces peaks so it stays clean instead of distorting — you'll see the LIMIT indicator light up when it's working.

Ads appear only in the free version on iPhone and iPad — the Mac version has none. Subscribe to Premium. Premium removes every ad — the App stops requesting them entirely. On the free tier you'll see one ad shortly after opening the App, and occasionally when you close the full-screen player or visualiser, finish the hearing test, or finish an import. Ads are frequency-capped, and they never interrupt playback: your music keeps playing underneath.

This only happens on iPhone and iPad. iOS asks whether the App may use your device's advertising identifier. Declining changes nothing about how the App works — you still get every feature, and you still see ads, just less relevant ones. In Europe, the UK and Switzerland you're also shown a consent form before any ad loads, as the GDPR requires; you can reopen it any time from Settings → Privacy choices in the App. You can change the tracking permission in iOS Settings → Privacy & Security → Tracking.

No accounts, and nothing that identifies you. On iPhone and iPad the free version shows ads through Google AdMob, and Premium removes them entirely; the Mac version has no ads. Beyond that the App collects only anonymous usage statistics (via Google Firebase) so we can improve features — never your music, your files, or personal information. See the Privacy Policy.

Double-tap any fader or knob (double-click on Mac) to reset it to zero. The Effects screen has a RESET button that clears pitch, speed and spatial at once. Selecting the Flat preset zeroes the whole EQ curve.