Mac OSX Yosemite 10.10.4
MacBook Pro (Retina, 15-inch, Late 2013)
Processor 2.6 GHz Quad Intel Core i7
Memory 16 GB 1600MHz DDR3
Details to recreate issue:
Load up any kit in groove agent 4 and drag a pattern pad over to the project window and watch the pads while it plays and you will notice that some of the pads don’t light up every time. As shown in the uploaded video.