The A values are not proprietary. The ACD system is all about price action. There are no secret numbers or secret values. The important thing is that you understand the ins and outs of the system and why you are choosing the values you are. ACD is volatility based, not price based. It's all about volatility and price action. That is why it's so effective. Some general advice though. Regarding the opening range, you will want to set that time based on your trading style. If you are more a counter trend trader, you will want to use a wider opening range. If you are more a breakout trader or momentum trader, use a narrower opening range. Good luck!