The “audio channel access” or “Do Not Disturb access” permission is an Android-only permission for Visualfy Connect.
It lets the Visualfy app silence the device sounds. The sounds your phone makes (alarms, notifications from other apps…) can affect the audio picked up during the conversation, so the transcription on screen can be wrong. That is why Visualfy needs access to the phone’s audio channels: this way, no noise gets in the way while speech is transcribed to text.
The following video shows how to grant this permission:
