Nevertheless, there is a consensus among repair techs that this type of check in key is tougher to keep in adjustment, i. e. , it is tough to have enough spring pressure to shut the outlet securely. The body of a trendy soprano clarinet is equipped with numerous tone holes of which seven six front, one back are coated with the fingertips, and the rest are opened or closed using a set of keys. These tone holes let the player produce every note of the chromatic scale. On alto and greater clarinets, and a few soprano clarinets, key coated holes replace some or all finger holes. The most common system of keys was named the Boehm system by its fashion designer Hyacinthe Klosé in honour of flute fashion designer Theobald Boehm, but it is not a similar as the Boehm system used on flutes. The other main system of keys is called the Oehler system and is used mostly in Germany and Austria see History. The related Albert system is used by some jazz, klezmer, and japanese European folk musicians. The Albert and Oehler methods are both in line with the early Mueller system. Around the turn of the 18th century, the chalumeau was modified by changing one of its keys into a sign up key to provide the 1st clarinet.