Here's how to assign the Click to the Phones output in the SPD-SX.
1. Press MENU.
2. Use the cursor buttons to highlight the "SYS" icon, and then press ENTER.
3. Press the cursor up or down button to select "CLICK," and then press ENTER.
4. Press the function 2 (F2) button to select the "OUTPUT" tab.
5. Press the + button to choose "PHONES ONLY."
6. Press EXIT when you're finished. The new setting is saved automatically.