If you want to change the key being used by the ME-25's Harmonist effect, please follow these steps:
1. Press WRITE + EDIT to go into EDIT Mode.
2. Press the HEAVY (Modulation) button once so that it flashes.
3. Turn the VARIATION knob to: 7.
4. Turn the PARAM 1 knob to adjust the Key based on the Key
that shows up in the LCD screen.