The TD-20 has a dual footswitch jack that can support up to two footswitches which can control various parameters. For example, footswitches can be used to scroll through the Kits, or start and stop the patterns. From the factory, the footswitches are assigned to increment and decrement through the Kits. Here's how to assign them to a different function if desired:
- Press SETUP.
- Press F3(CTRL).
- Turn the VALUE dial to choose "USER."
- Cursor to "SW1" and turn the VALUE dial to choose the desired selection.
- Cursor to "SW2" and turn the VALUE dial to choose desired selection.
- Press EXIT when you're finished. The new settings are saved automatically.
The following are links to footswitches that are compatible with the TD-20.
FS-5U: https://www.boss.info/global/products/fs-5u_5l/