FAQ-c003 : No sound input. Measurement display such as measured values and graphs is not available.
[Answer] : For the app that require sound input, it accesses the built-in microphone device. At the time of the first access to Microphone after installing the app, you will be asked authorization to access them by the iOS system. If you have not enabled this setting, the app can not access them by privacy restrictions of the iOS system. Please enable the access permission on the iOS setting, "Settings > Privacy & Security > Microphone".