Hello John, thank you for asking us your question about the Samsung Galaxy Buds4 Pro. That's a great question! Yes, you can set the Samsung Galaxy Buds4 Pro to Active Noise Cancellation (ANC). To stop them from automatically switching back, you will need to disable some of the adaptive features that detect voices or emergency sirens, and adjust your touch-and-hold earbud gestures. Please follow these steps to lock the noise cancellation mode: 1. Disable Automatic Switching Features. The Buds4 Pro are equipped with AI features that automatically switch your earbuds to Ambient Sound mode when you speak or hear a siren. To disable this: * Open the Galaxy Wearable app on your phone. * Tap on Auto switch to ambient sound. * Toggle off both Voice detect and Siren detect. 2. Lock ANC via the Wearable App. You can force the earbuds to stay on ANC in the application menu: * Launch the Galaxy Wearable app while wearing the earbuds. * Under Noise Controls, select Active Noise Cancelling (you can also customize the ANC intensity slider). 3. Customize Pinch and Hold Gestures. By default, pinching and holding the earbud stems cycles through your noise control modes. To prevent accidentally changing the setting: * Open the Galaxy Wearable app and go to Earbud controls. * Tap on Pinch and hold for either the Left or Right earbud. * Uncheck the other modes so that the gesture only cycles between ANC and Off, or disable the cycle altogether so it stays locked on ANC. Hope that helps! If you have any other questions, feel free to contact Support! We're always here for you! Thank you for being a staunch Samsung customer. - Debra