You have 3 options to choose from, your fitter can set these using his software (Target):
When streaming:
- Default: your aid’s volume button (up/down) are used to mix the loudness. More of ambient sound or more of streaming source sound. Up -> Streaming is louder. Down -> ambient sound is louder.
I found this not satisfiyng, since the ambient sound cannot be switched off completly. And if I want to mute the mics it causes to increase the loudness of the streaming sound.
Or - Disable the mics when streaming. (in Target-SW: Fine tuning, Autosense, streaming program options). This cuts the ambient sound completely off, up/down buttons change the loudness of the streaming source
Or - Long press button down to mute/unmute ambient sound. (in Target-SW: Device Options)
Muted: This cuts the ambient sound completely off, up/down buttons change the loudness of the streaming source.
Unmuted: up/down buttons change the loudness of both ambient and streaming simuntaneously
For phone calls with your mobile the HA’s microphones are always ON. But again, you here no ambient noise.
And no, this has nothing to do with noise cancelling. It only mixes the microphones signal to the output signal as it is set in the options. If you have an open dome fitting, the effect will be less. Since the ambient noise bypasses the HA.
Edit: I double checked it in Target, and made some ammendments.