Every brand has its own statement, there is no so-called standard level, yours is only the standard of Yamaha brand, the higher the opening, the brighter the timbre. Yamaha has a high standard opening, which is different from many brands. This is why people think that Yamaha's timbre is thin. The opening level can be within a certain range according to your own preference for timbre. The pitch of saxophone depends on its own reasons. Adjusting the treble hole will make the whole range inconsistent, right?