I've got a few audiomoth's. Two of them respond to the chime to set the time. However, the other two do not respond. I can set the time using the Time App, but this is inconvenient for me. Any suggestions what may help get it to work?

The pre-configured gains range from low to high. In the manual I cannot find any physical numbers that correspond to how much gain 'low' actually means. Would anyone be able to provide me with a table?