Casio Casiotone LK-S450 User Manual page 134

5.
Press the button for the number of the track you want to mute.
The track that corresponds to the button you press is muted, which is indicated by a broken line
under its track number.
• To unmute a track, press its track number button again.
6.
Press BACK to exit the setting operation.
EN-133
Recording Your Keyboard Play