Yes, I think you've identified the difference. I, too, had purchased all three of the other Symphony Series libraries for the $300 crossgrade price, which seems to explain why I was fortunate enough to get the Percussion for $49.Gotcha. So perhaps that's the problem. I essentially got those first three for $450 while you paid $900. It may bum me out to not get a $250 off voucher, but it feels perhaps silly for me to complain when I did get those savings on the rest.