Hi,
The parameter 'Price Simulation' lets you choose how ticks will be simulated on the basis of your price history. The default value (“Mix”) uses HLC (to high, to then low, then to close) pattern for descending candles and LHC (to low, then to high, then to close) for ascending candles.
Please refer to this post for details:
http://fxcodebase.com/code/viewtopic.php?f=31&t=3036#p7064As for the Data source tab, it doesn't make sense for backtesting. You should ignore this tab when backtesting.