It's a vst and a real pain to program. I used the SWAM saxophones which are the most realistic I've ever tried. You can really shape the sound well with them so they *can* sound realistic, but straight out of the box they sound pretty crappy. You need to go through each line several times and shape the expression, vibrato, attacks, growl/flutter, bends, etc manually. With any of the SWAM or Audio Modeling instruments, a breath controller is pretty much required. There are almost no keyswitches, so all articulations are shaped with how you blow and tongue just like a real sax. Sometimes this is great, and other times it makes relatively simple things take forever. I use the tecontrol usb breath and bite controller 2. Hope some of this helps!