NOTE: Transcription of the text of the video, you can translate it into other languages with the Google translator
On all my series models CUSTOM You can choose between three different backbores models, the standard one, one more open and the other more closed.
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I have noticed that some musicians take my mouthpieces with the inside backbore open, thinking that they will have a bigger, more powerful sound, they will be able to play louder.
In many cases this can be a mistake and you can find a completely opposite reaction, less volume of sound and a sound with poorer harmonics.
The function of the inner neck is to regulate the amount of air you throw.
If you blow a lot of air, the open inner tube is the best option since you have to vent all the volume of air that you are blowing, but don't buy it to have more or less volume of sound.
The inner neck has to be proportioned and compensated for the pressure and amount of air you draw, otherwise the mouthpiece simply won't work for you.