Ah, thank you for the bass regime. I will try out loading bass trombone patches. And if it sounds ok (which I can believe), that's no problem at all.
As I am writing for my trombone quartett, I am not particularly interested in the range of orchestral trombone, but rather [chamber] trombone itself (or perhaps what would be solo trombone in orchestra - I just think of David G1 - C5 [though there are performances going to Eb5], Sachse Bb1 - B4, Gräfe F1 - C5). So while the tenor's bottom range is poor, but can be fixed by using bass trombone, the top range is... ok, though not in accord with your own statements about the range. But the only reason I bought Alto Trombone is I hoped F5 is finally included in this instrument - now I have to buy the pro software version as well; and even then, the highest note G5 currently used is not in its range.
@William: What do you mean with "normally used range"? This goes at least down to F2, even in warmup trainings. Within an orchestra, I agree you won't need to play pedal notes (ie below F2) very often. But since there is no extra instrument such as "solo trombone", the ordinary one should do the work, as solo concertos will definitely use those notes. And what do you mean with your last paragraph? I am talking about these ranges, as the only way - and correct me if I'm wrong - to know the ranges of an instrument is to buy it before. Btw. there is no Ravel on Dimesion Strings II (yet; and neither on DBrassII, if you meant this one). Btw2, all the issues I was talking about here are for a piece that is going to be played by my (nonprofessional) ensemble, which I wanted to provide with nicer demos than before. I do not want to create something that only a computer can play, this is real world.