i use sonar just like a tape deck.
and when i DO play keys (not very often, but it does happen) i simply plug the midi into my soundcard,
trigger the sounds i want with VST's, and once i get the performance down, i freeze the synth and bounce to audio, and never go back to any of the midi.
i mostly put up mics, capture performances, and mix just like a tape deck.
does that answer a question? i'm not sure....