Building an oboe is a time consuming and meticulous job. When playing, the drilled holes are manually closed by a padding. So there must be a perfect fit between each hole and its padding. The inner side of the wood is to be milled with utmost precision and polished subsequently. This production step is extremely fragile.
Except for regular quality control an auditive control is carried out by an oboist. In the case of Buffet Crampon it is done by Eric Speller.