I would be interested in any answers to this myself.I just received my new WK7600 a few days ago and last night decided to try out the arpeggiator.Did the same procedure you did...selected my arpegg. style and....nothing. I didn't get the flashing tempo light either.Tried several combinations with no results. Bottom line is...the arpeggiatior does not work. Any help would be most appreciated and the manual isn't a lot of help.