If the hundreds (thousands?) of reverb unit presets shipped with Studio One 2.0 still aren’t enough, check out this list of reverb Impulse Responses for download. I haven’t tested them all out myself yet, but I assume that they should work fine with OpenAir. As a lover of big-sounding 80s music I will be downloading some today to listen to for sure.
Yes, the listing is in German, but I think you can figure out the links even if you don’t speak the language. Or use Google Translate