On many modern Stratocasters, the first tone control affects the neck pickup; the second tone control affects the middle and bridge pickups; on some Artist Series models (Eric Clapton and Buddy Guy signature guitars), the first tone control is a presence circuit that cuts or boosts treble and bass frequencies, affecting all the pickups; the second tone control is an active midrange booster that boosts the midrange frequencies up to 25 dB (12 dB on certain models) to produce a fatter humbucker-like sound.