Let's talk about the standard modern chromatic, tuned to the key of C.
On that instrument,the same C note appears twice at two adjacent holes, both blow notes. The first C hole ends an octave, the second one begins a new octave.
That being the case, when navigating through a piece of music and C has to be played, the player always has to choose which C hole to use. (Unless you're playing the lowest or very highest/last hole -
What are the criteria for choosing which C to play?
I am not a very serious player on the chromatic, but I do fool around with it sometimes. My general rule is that if I get to the end of an octave and intend to continue playing into the next octave, I jump to the second C hole to start the new octave. But if I intend to stay in the same octave and move back down (or just stop playing) I play the first C hole.
Can anyone add to this? Is there something wrong with my method - for example, some inefficiency or error it can lead to?