Listening to surrounding sound (ambient sound mix function)
Turn on the ambient sound mix function while listening to music to use the mic to mix surrounding sound into the music you are listening to. Enjoying music while also being able to hear surrounding sound is useful when you are listening to an in-flight announcement or talking with your headphones on.
Turning the ambient sound mix function on
A warning sounds 4 times, the NC LED lights orange and the ambient sound mix function turns on.

Ambient sound is not mixed into the low range that is not affected by announcements and conversation.
Turning the ambient sound mix function off
An alert sounds, the NC LED starts blinking again, and the ambient sound mix function turns off.
Depending on the noise cancelling mode setting, the alert will sound once (Airplane mode), twice (City mode), or three times (Office mode).

Turn off the ambient sound mix function by sliding the NC MODE switch to the left.