I did some coding work for VT, an alert system that allows for removing the fantail graphics and getting an (audio or arrow) alert when the magenta or black(mine white) outer lines both cross an ema envelope. I will post it here, but please see the coding forum to get the details for install as a trading system, and set up. It is based on my previous post. It also allows for price and ema envelope crossover alerts, and can show only the 2 outer lines of the fantail if you want.
I am using for the AUD/USD cross 50ema envelope sizes at 18 and 36 pips.
Anyhow just a thanks to Walter, Bemac, and the team for inspiring work, and bringing out the best in this brave new world.