However much is necessary to get into the level ballpark of the references. I rarely look at the numbers - just move the sliders and go. If anything sounds wrong at the level I have the mix going at, I'll know there is an imbalance somewhere, which is the beauty of working like this. @brain: yes, with every new project I use Nebula more and more. I imagine in some years, as the technology matures, as does our available CPU power and RAM, I'll be using mostly Nebula-driven plug-ins alongside real hardware.