The Fixed Hihat feature in the TD-15 allows you to have a closed hihat instrument sound without having to place your foot on the hihat pedal. This is a great feature to have when your foot that you'd normally use to control the hihat pedal is being used to control a second bass drum pedal.
It can be programmed on a per-kit basis. Here's how:
1. Press MENU.
2. Press F1 (INST).
3. Press F2 (EDIT).
4. Cursor down to "Fixed HH NORMAL."
5. Turn the dial to choose one of the fixed selections. There are 4 to choose from (Fixed 1-4).
6. When you're finished, press EXIT to return the main menu. The new setting is saved in the Kit automatically.