[upanddown]

A few days ago I happen to come across a video by Phil McGrew talking about his MACD Dot method. I understood most of it, but I was wondering if anyone here knows how the Dot signal filters works? He said on the MACD histogram that it has to be a certain hight and and the rate of change - roll over of the histogram or market has be a certain amount or how fast it happens, before a Dot appears on the charts. I am not really sure about this.
So I was wondering if anyone happens to know the part about the rate of change and knowing when a Dot is placed on the chart? How is that calculated ect.
Any info about this would be great.

Thanks,