There seems to be an issue with the on-board microphone. The audiomoth is not responding to the chime without external microphone, but does respond when the external microphone is connected. When in DEFAULT mode and on-board microphone, it is recording, but no real sound (it doesn't record my voice). When repeating this but using the external microphone, I can clearly hear myself. Not sure why this is. I tried on two new audiomoth's and both have the same issue. They were purchased in December 2021.