I've the same problem that this guy
http://www.korgforums.com/forum/phpBB2/ ... 376#576376
(On my Volca Beats, the LED Lights for steps 9, 10, 11 & 12 never light in Step Sequence mode).
What must I doing now ?
Can I have the Volca Beats Schematic, or the Service Manual, in order to check the pcb to seek some failure.

Hope you can help us
