Tacx Neo and Tacx Desktop Films


I was wondering if there is any way to emulate a different cassettes when using tacx films.  I found that there is a difficulty setting but I think this reduces the slope (making the ride easier) which is not quite what I want.

my easiest gear is 38/28 and its quite a grind on the harder films tacx has to offer.  Is there any way for the app to "feel" like I am riding a 34/30 (or something else) without changing the elevation from the ride via the difficulty setting?  I am running the PC version of the app