Solid State Symphony is an orchestral simulation that also includes automated features like a gated pad, two pitch-modulated synth elements, simple bass and percussion sequencers, and chords. It is meant to be played in real time, and allows you to bring in the different sections.
With MIDI Designer we go a little farther giving us the possibility of modifying several parameters at the same time.
http://www.indiginus.com/solidstatehome.html
Enjoy!