TODO: Once I update to the latest 6.0 firmware I need to test if this problem still exists.
https://www.fuji-x-forum.com/topic/29600-x-h2s-mic-volume-ignores-memorized-setting/
Any mic/line in gain or settings on the C1-7 modes are ignored upon restarting the camera, and the camera uses the settings configured under 🎥 (movie mode) instead.