Hohner A Special 20 Diatonic Harmonica grand-auditorium The tone control section is

The tone control section is a highly modified Baxandall type that is tuned for less control interaction and more boost/cut capability

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thanks to a chromatic tuning mode and ultra wide tuning range

Phase switch (feedback control)

Hohner A Special 20 Diatonic Harmonica grand-auditorium The tone control section isAwesome response, superior bendability and the sweetest tone ever. The Special 20 harp is the first choice for those learning to play. Its special airtight design makes it the most recommended go to harp for harmonica players of any style, including blues, country, folk or rock. The plastic comb doesn't absorb moisture making it longer lasting. Harp of choice of harmonica virtuoso John Popper (of Blues Traveler) and played by Bob Dylan on his 2007 08