Ah I see. Hmm maybe, since the 4 valves cover the whole octave from Bb down to B, you could give every octave that same valve fingering, and control the octave

Ah I see. Hmm maybe, since the 4 valves cover the whole octave from Bb down to B, you could give every octave that same valve fingering, and control the octave and other things with the other hand. Also, I think everyone fingers trumpet valves with their dominant hand! I couldn't play very fast at all with my non-dominant hand. So the keys for the valves on a keyboard might have to cater to both handednesses.