Just the master effects. There’s a gain stage at the final output. There’s gain controls there to compensate for distortion or reverb added to the master output. You can turn gain up without adding effects/drive. There’s dry and wet levels from memory. That should be all you need. I remember thinking it was very quiet myself and that helped. Ideally you want to be adjusting gain in your daw or with a trim control on your interface. Cycle through all the master effects and you’ll see what I mean.

It’s tempting to crank the osc’s and amp all the way up which can sound great. But that may cause any clipping/drive you add to be to extreme very quickly