Layers are simply multiple entry signals for the same trade. For example the software is default 1 layer at 2.00, which means you will receive an entry signal when the pair is 2 stdev from the mean, you can add a 2nd layer for eg at 2.25, a 3rd at 2.50, so if the pair moves against us initially you can lower your cost average of the trade and take advantage of volatility. Currently we can only backtest 365 days backward, since the program is crunching a huge amount of data/variables, however Im having my programmer work on increasing that, should be able to offer something longer soon. Too find good pairs I run backtests on each industry/sector, and filter results for pairs showing avg profit per trade more than $300(10k trade value), and a non-trending ratio chart. Hope this all makes sense, I really do try and keep it as simple as possible.