Aerophone AE-20, AE-20W: How can I mute the internal sound engine in MIDI Control mode?

The Aerophone AE-20/AE-20W has a "MIDI Ctrl Sound" system parameter that controls whether the internal sound engine produces sound when the [MIDI CONTROL] switch is "On." By default, this is set to "On."

To mute the internal sound engine, set "MIDI Ctrl Sound" to "Off."

1. Press the [MENU] button.
   The menu screen appears.
   
2. Use the [-] [+] (◀/▶) buttons to select “MIDI Ctrl Sound” in the System parameters.
3. Press the [MENU] button.

4. Press the [-] (◀) button to to set the value to "Off".

   System parameters, “MIDI Ctrl Sound”	When [MIDI CONTROL] switch is “On”
   On (default value)	The internal sound engine produces sound.
   Off	The internal sound engine does not produce sound.

5. Press the [SCENE] (▲ or ▼) button to return to the scene screen.