For hard rock, a Marshall Plexi (Super Lead) starts around gain 5.5, bass 5.5, mid 6.5, treble 6.5, presence 5.5 (out of 10) — averaged across 12 famous hard rock recordings made on one. Use these as a starting point, then let GuitarToneAdapt re-dial the exact tone for the guitar, pickups and amp you actually own.