I guess, but the sequence of positions 6->5->4->3->2-1 maps to valves - 1+3 (6) - 2+3 (5) - 1+2 (4) - 1 (3) - 2 (2) - open (1) All I mean to say, sliding

I guess, but the sequence of positions 6->5->4->3->2-1 maps to valves - 1+3 (6) - 2+3 (5) - 1+2 (4) - 1 (3) - 2 (2) - open (1) All I mean to say, sliding a little bit at a time up the slide is easy to map to "short slide higher pitch" in a way that valves don't