I use Sibelius 5 but I don't use it primarily as a notation program, I consider that I am using it to program a synthesizer, which if you use the playback to see what it sounds like, is exactly what you are doing.
Maybe not what was intended by the writers but can work very well. It means that you can do things which are impossible to do with real instruments, sliding woodwind instruments for example, adding extensive trills to brass instruments over 20 bars if you want. Playing violins or strings at 120beats per minute using 64th's, no-one can play that fast but it is a synth not real people so it can be done.