Start with Level at unity, Tone at 5, and Gain around 4 for a light crunch. It is very dynamic, so set the Gain a touch higher and let your picking control how dirty it gets.
Is the BD-2 good for more than blues?
Yes — despite the name it covers light crunch through gritty rock rhythm and works well as a dynamic always-on drive or a boost into a dirty amp.
Recommended starting points are community-researched estimates — every pedal, amp and guitar is different. Dial from here, then GuitarToneAdapt helps you match a target tone on your own rig. Pedal comparisons · Amp settings · All tones