To some extent the audience can't tell. However I know when I used to use a roland modeller, I always got told I had a good sound, but the sound guy should fix it up a little. When I bought a 5150 people thought I finally got the sound guy to do his job, and/or I was playing better ... it was just the difference in the tone and the feel. I don't think its so much that the audience can't hear the difference, it's that most people (non-musicians) don't give a damn. Alot of em in a club, are wishing they'd come the night before, when it was a DJ, and not a live band.