Need some help for my Commercial

I would like to know if any of you payware gurus know of an aircraft (freeware will work too!), preferrably a turboprop, that closely models cabin pressurization? I need a model that has a cabin altitude controller that would move similarly to the real thing regarding differential and isobaric range, dump valves, etc.I understand everything except how a normal op would take place using the system. Thanks for any help you can provide.CraigEDIT: After a little research it looks like the aeroworx B200 would work, but I'm not buying anything before I get some feedback about other aircraft. And, I know my subject line could have been less obtuse. I apologize. :)