Controlling the Melodics app from the SP-404MK2

[EXT SOURCE] button

Enables audio input from the computer.

[ROLL] button

Starts or restarts a lesson.

[PITCH/SPEED] button

Switches between Melodics app modes (performance/practice mode).

[CTRL 1] knob

Controls the volume of audio input from the computer.

[CTRL 2] knob

Controls the metronome volume.

[CTRL 3] knob

Controls the YOUR NOTES volume.

[SHIFT] button + [CTRL 2] knob

Controls the GUIDE NOTES volume.

[SHIFT] button + [CTRL 3] knob

Controls the BACKING TRACK volume.

[SHIFT] button + [EXIT] button