I have X2 Producer 64bit and a Focusrite 18i20 interface. I get clean sound when using any soft synths that came with producer. However, if I use any external VST, i get serious distortion. The distortion increases exponentially with the number of notes played simultaneously. This didn't happen when I initially installed these VSTs, so I probably did or changed something. As a newbie, I have no idea where to start looking.
Any suggestions would be appreciated.