Drive
How hard it's pushed.
Turn it upGritty, distorted, aggressive.
Turn it downClean or just warm.
Pushing a speaker until it gets warm, then gritty.
Overdrive: pushes the sound until it gets warm, then gritty, then distorted. Mostly meant for guitars.
How hard it's pushed.
Brightness of the drive.
Final volume.
See the recipes table for per-layer settings.