Hi,
If you are interested in finding a good, stable VST host capable of working with Audio and MIDI, take a look at
http://www.cantabilesoftware.com/I used this in Professional guise for several years in my Pink Floyd tribute band to play backing tracks, host a VST Hammond Organ, play samples via keyboard or CC trigger (so that I could retire my old A4000 sampler) and provide a DMX controlled light show synced to the backing tracks, where the DMX controller itself was responding to MIDI in a MIDI file that played back in time with the backing track.
Cantabile handled everything I threw at it! It's optimized for stage use, so better than a DAW like Cubase in that context.
Worth taking a look at anyway, if you are looking for options.
Cheers
Derek