I'm trying to enter a score of the Strauss Emperor Waltz. The score I have includes Trumpets in F (alongside Horns in F).
Overture knows Horns are in F but doesn't offer F trumpets.
So I chose Trumpets in C and assumed I'd force the Overture Track properties to transpose these Trumpets by 7 semitones (down) exactly as the Horn properties are set to 7 automatically.
I set the key signature of the trumpet track to match the horn track with Options | Show | Tranposed Tracks switched on but the trumpet sounds a semitone too high - I have to set the semitone adjustment to 8 to obtain the correct pitch on replay by a trumpet in GPO.
As far as I can tell, the trumpets in GPO are in C.
Furthermore when I switch Show Transposition off the trumpet track appears ina different key from all the others - one semitone down. Presumably this is related to the fact I've had to pitch the trumpets down one semitone but I really want to see all my instruments in the same key at this point.
So the outcome is that I can either have the correct keys displayed but the wrong pitches played, or vice versa.
Is anyone able to spot what I'm failing to understand about Overture SE, GPO and transposition and in particular why don't I hear the correct pitches when I set the trumpet to transpose by the same extent as the Horns please?
Many thanks for any insights you have.