TD-15, TD-11: USB Audio Volume
Here's how to adjust the USB audio Volume in the TD-11 and TD-15.
1. Press MENU.
2. Press the down cursor button twice.
3. Press the function 3 (F3) button for "SYSTEM."
4. Press F3 (OPTIONS).
5. Press cursor down to choose "USB Audio Volume."
6. Turn the dial to adjust the value as desired (0-100).
7. Press EXIT when you're finished. The new setting is saved automatically.