Instruments are allot like snowflakes – No two instruments are alike, including same exact models due to condition (extra solder not seen inside, etc.)  All instruments have some notes that can use a “tuning fingering” or alternate fingering to assist in controlling pitch tendencies. These alternate fingerings are different for every player due to their: instrument, mouthpiece, embouchure, reed, reed strength, ligature, air stream, and breathing/blowing prowess.