Adjusting the volume level, To adjust the volume level, To mute the audio – Casio XJ-M250 User Manual

XJ-M155, XJ-A141 (D****B) User Guide, XJ-A146 (D****B) User Guide, XJ-A241 (D****B) User Guide, XJ-A246 (D****B) User Guide, XJ-A251 (D****B) User Guide, XJ-A256 (D****B) User Guide, XJ-A241/XJ-A246*, XJ-A251/XJ-A256*, XJ-M140 (B9***B), XJ-M145 (B9***B), XJ-M150 (B9***B), XJ-M155 (B9***B), XJ-M240 (B9***B), XJ-M245 (B9***B), XJ-M250 (B9***B), XJ-M255 (B9***B)