You can adjust the volume level for each pad in any of the TD-11's kits.
1. Choose a desired kit to edit.
2. Press F1 (INST).
3. Press F2 (EDIT).
4. Press the cursor down button to choose "VOLUME."
5. Hit the pad that you want to adjust the volume level for.
6. Turn the dial to adjust the volume.
7. Repeat Steps 5 and 6 to adjust the desired level for the other pads.
8. Press EXIT when you're finished. The new settings are saved in the kit automatically.