[vintermann]

One trombone feature not mentioned here is that the length of the pipe apparently affects the timing enough that they have to compensate for it.

[justonceokay]

This is a feature of every instrument. Even with piano you have to start pressing down a key slightly before you want to ring out or you will be behind time.

[vintermann]

Yes, but for trombone it varies markedly from first position to seventh.