Posted by Keith B on September 22, 2002 at 12:12:37:
In Reply to: The compensation system illustrated posted by Klaus on September 22, 2002 at 11:19:15:
There is quite a good interactive explanation at the link below.
I use a boosey 982 with the 3+1 valve setup, and I find it is far easier to play, than instruments with all four valves in a line, rotary, or piston.
I can play fast passages that need the 4th valve much better using my left hand, than have to rely on my little finger, which is far weaker.