[visionegg] Newbie question

Hi,

I was wondering what ways people used for changing display parameters from trial to trial in order to test combinations of independent variables. Is there a typical way to do this through the FlowControl methods (that I haven't clued in to)? My hope is to be able to define a drawing function that is contingent on a multiple variables (including time) and then populate a long list of sub-classed presentation instantiations (inefficient, I know) together with their controllers and appropriate settings.

Thanks in advance, 

Leo
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