I am looking for a rackmount to use in orchestral score. Since I will playback from the module, the sound quality is the most important for me. Second, I will concern about the multitrimbal parts. I heard from my friend K2600R + orch ROM has a outstanding sound quality. It uses VAST (what's this?) But I also heard about an orchestral module from E-Mu (Virtuoso 2000) has lots of polyphony & multitrimbal. I still have no idea on buying which module. Can anyone give me any opinion? Thanks.