We've released an update to the AudioMoth Live App which adds the ability to control the gain settings for your AudioMoth USB Microphone on the fly. This app update comes with an update to the AudioMoth USB Microphone firmware. Flash your device with this latest update using the AudioMoth Flash App.
Download AudioMoth Live App 1.1.0 here
Once your device is on 1.3.0, from the File menu, simply select Show AudioMoth Gain Controls to start changing gain settings.