The HPD-20 has an "Undo" feature which lets you undo an edit change that you've made to an instrument or a Kit. For example, if you've edited the pitch of an instrument in a Kit, and decide that you no longer want to keep the changes you've made, use the Undo feature to bring back the original settings.
Here's how:
1. Press and hold the SHIFT button and then press KIT(UNDO) - "Undo Kit. Are you sure?" appears in the display.
2. Release SHIFT and KIT and then press the cursor right arrow button(>) to highlight "YES."
3. Press ENTER.