precisely what I'm talking about... it is possible that the results can be helped substantially by using midi guitar or breath controller, giving playing envelopes very difficult if not impossible to achieve via keyboard input, no matter how much post production has been applied. But these would require just as much playing skill.

Nevertheless I am constantly amazed at some of the results of the best of my collection, especially given the limitations of controller functions in GM1 spec. To be able to produce results like these without pattern generators and quantisation shows real musicianship.