Hold on the Tap button for a few seconds, and the button lights will be turned off, signifying that the Spark has entered tuner mode. In this mode, the Speakers will be deactivated.
In the tuner mode, the five buttons represent how on-pitch the the notes are.
When a note is perfectly on pitch, button 2 will light up a green light.
If the notes are sharp, button 3 and 4 will light up red lights.
If the notes are flat, button tap and 1 will light up red lights.
To exit tuner mode, hold on the tap button for a few seconds, and the flashing lights will resume.
The tap button will always be flashing; the flash indicates the tempo of the delay function. To modify it, simply tap on the Tap button a few times to the tempo you desire.
When you click on button 1~4, you will access one of the 4 default presets. When you first click on it, the button will be light up, and it will not be flashing. When you make any modifications to it, the button will start to flash, signifying that the preset is no longer in its default setting.