Here's how to adjust the sensitivity of each pad in the TD-8:
1. Press SETUP, and then F1 (TRIG).
2. Press F1 (BASIC).
3. Cursor up to highlight "Sensitivity."
4. Hit the pad you want to adjust.
5. Turn the VALUE dial to adjust the sensitivity (0-32). Using a higher value makes the pad more sensitive.
6. Repeat Steps 4 and 5 for any remaining pads as desired.
7. Press KIT when you're finished. The new settings are saved automatically.