Hi, thanks for using our software. There are some tips for you.
1. Before you start to record, please make sure that you can hear the sound well on your device. Prepare a workable microphone and plug it into the computer.
2. After activating the program, please choose the audio input as “system sound and microphone”.
3. Note that after you run the screen recorder, you cannot change the audio input device, which means that you cannot plug in or remove microphone from the computer after you have run the recorder. Otherwise, you need to re-launch the program to make it record sound successfully.
And you’d better tell us which recorder you are using for recording.