The Aerophone AE-10 has two types of settings: system settings and tone settings. The settings for individual tones, such as Bite Control setting, are not saved automatically and must be saved to the tone manually. You can see which settings are "system settings" or "tone settings" in the "Menu List" in the Aerophone AE-10 Owner's Manual.
Example:
Items marked the star symbol indicate tone settings, and others marked "S" are system settings.
For details on how to save a tone, see the related Q&A "How do I save the tone settings in the unit?".