How can I use the 16 track sequencer on the Casio WK-3500 ? It's been a year since I bought it and i couldn't figure it out. Please tell me each step at the time ( I'm talking about the thing where you can record 16 instruments separately, and then put them together to make a song or something like this for the left hand ). This stuff is weird on the Casio WK-3500 - PLEASE HELP !