Hello,
Regarding the microphone related issue, please refer to the following link.
* How to record your voice in Windows Vista/7/8/10
https://www.bandicam.com/faqs/how_to_re ... icrophone/
If it doesn't work, please let us know the model of your microphone.
Also, please attach screenshots of Bandicam Recording settings window and Windows Sound settings window.
We look forward to hearing from you.
Thank you.