Fixed an issue where no sound came through Bluetooth earphones. - Fixed a problem where connecting Bluetooth earphones or a headset produced only a beeping tone instead of amplified sound. Audio now plays correctly regardless of the earphones you use. - Improved audio stability on devices where the sound could drop out or pick up noise. - Fixed the notice that failed to appear when returning to the app after a phone call. - Simplified personal adjustment into a single "Sound Tuning" screen. - Reorganized the in-app tutorial. - The app now requires iOS 15.0 or later. Thank you for using Smart AMP. We welcome your feedback.