Hi,
In fact, ^ GSPC is the ticker of the SP500 on the alpha vantage data provider. As I said, my algorithms works better with external data rather than from the broker. The best choice for me is alpha vantage. The main problem I have is to use the external data (sp500 from alpha vantage) I use to trade the fxcm sp500.
Zorro says that is possible but I don't know how to code it, I've try to use set(PRELOAD), but It isn't woking :-(