Putting all these into Google and finding the answers to the queries is going to be very confusing and difficult. I think you should ask it to some experienced guy personaly instead of asking it online.
I’ve used the Gann Hi/Lo activator myself for several years and can tell you it is extremely similar to a trailing volatility indicator, which I prefer moreover. The Parabolic SAR can also perform basically the same function by minipulating the settings.
The other I’ve never heard of…:o, but it sounds nicely complicated!