cusetownusa
2022 LR5 MSM/Bl | 19"
I assume it is active all the time, such as when you use noise cancelling headphones on an airplane. There shouldn't be any need to have music playing for it to work.
I would assume the same...not sure why it would only work when music is playing. Maybe they have provided a way to turn ANC on or off like headphones do but doubt it would be tied to music.