Thanks for the honest feedback — both problems you hit were real, and both are fixed in the update that's on the way.The high-pitched noise came from Live Amplify. That feature feeds your microphone back to the output, so without headphones the mic picks up its own sound and squeals. That's on us — the app should never have let it start on the speaker in the first place. It now requires headphones and stops on its own the moment they're unplugged.On the volume: iOS doesn't allow any app to change the system volume or the audio of other apps, so the boost only applies to audio playing inside Volume Booster. If you turned the dial with nothing loaded, you'd have heard nothing at all — which sounds like exactly what happened. The new version opens with a demo you can start in one tap, with an on/off switch so you hear the difference straight away.If you're willing to give it another go after the update, I'd genuinely like to know whether it works for you. You can reach us directly at info@aswapps.com.

Hi Harold, thanks for taking the time to write! 🙏One thing that might help: iOS doesn't allow any app to change the system volume or the volume of other apps like YouTube or Spotify. Volume Booster amplifies audio played inside the app itself — so tap "Play Demo Sound" on the home screen (or add your own music with "Add Your Music"), then turn the dial up. The difference is very audible, and the equalizer, bass and spatial audio all work on it too.You're also on Version 1.3 — the latest is 1.3.3, which fixed a bug that could stop playback entirely on some devices. Please update from the App Store and give it another go! ✨If anything still isn't right, email us at info@aswapps.com and we'll help. 💛