So, If say, I use one of the 2 IRs in my pedal in place of that IR (Im going to buy some IRs once I get a better feel for this thing and kind of get an idea of what kind of IRs I should even be buying) Is there a major drastic difference? Like, do different IRs create a drastically noticeable difference? Also, do any of you know of any good free IRs out there. So I can get a feel for using IRs before I go and spend 20 dollars on something I have no clue what Im buying??