You can re-configure the DD-500's footswitches to go up and down presets using the following steps:
1. Press EDIT.
2. Press Down arrow to select SYSTEM.
3. Press EDIT.
4. Press Down arrow to select: FSW (footswitch) MODE.
5. Turn the TIME/VALUE knob to select: SW DN/UP.
6. Press EXIT twice.
In this Mode, the DD-500's three on-board switches will function as follows:
"A" - will turn the current delay program on or off.
"B" - will go down thru preset program numbers.
"TAP/CTL" - will go up thru preset program numbers.