The microphone in a MVC500 or MVC800 doesn't work, often the LED is orange/yellow.
This could be bcause a microphone with a newer firmware is connected. The current official firmware får UVC50 and UVC80 doesn't support newer microphones.
Upgrade the UVC50/UVC80 with firmware version 92.422.0.33 or later.
Firmware file UVC80(UVC50)-92.422.0.33.rom can be obtained from Co-Ideation.