Dimensional problems
The position, length and shape of a tone hole determine the intonation and the sound character of the respective note.
If you are dissatisfied with your intonation or sound characteristics of a particular tone and ensure that other possible reasons are excluded, the position or shape of the tone hole or hole should be changed to meet the player's requirements. Intonation read more

The shape can be quite complicated. In addition to the pitch and sound, a change can also have a significant impact on other notes. This type of work should only be performed by experienced, knowledgeable experts who are aware of all acoustic consequences. Voicing read more

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