You really should have posted that link in your first post. That pre-made board restricts the ways it could be driven. For example I was going to suggest a circuit that would have required a single tpic6c595 chip and 6 pwm pins. That board's internal wiring makes my idea impossible.
I can't understand your description above. It certainly does not sound like it is complete. Can you draw a schematic to explain your idea? Hand drawn is ok.