Speaking merely as the kind of person who holds the fall meeting in June, I would like to say that instruments do not transpose, people transpose. Transposing is done by the brain, which sends instructions to the fingers.

If a person puts three fingers and the thumb on a C recorder, a G comes out, no matter which way the wind is blowing, whether you are driving on the right side of the road or the left, and whether it's Daylight Savings time or not.