A-zu-ra's tips for high scores:
ACTIVITY - Have an arp running at all times for maximum points. Just...have it running.
FOCUS - Don't just have one arp running at low volume in the background. Give some arps some focus as like the lead instrument or something. Unlike ACTIVITY, having a main arp running at all times is not required for maximum points.
Also, here's the ASCII in case your web browser hates pipes: http://puu.sh/h8Nx9.png