Hi Johnny,
There’s a significant difference between playing the middle C# as “all-fingers-off” or with the octave key and “all-fingers-on”. The quality of sound seems better with the latter technique; it gives a “warmer”, “fuller” sound. It’s considerably harder to remember and do when playing in the key of B, for instance where I’ve (lazily) gotten used to use the small Bb key between A and B instead of the A+side-key combination. I wonder if it’s just my horn, and hence not worthwhile practicing the “all-fingers-on” technique, and if a better horn will eliminate the problem. What is your experience?
Jan