Remember I said that every dimension of the pipe affected the action in
some way? Well, a larger volume middle also favors accelleration and
mid rpm power. Smaller volume middle favors high rpm power.
How about changing the middle length and volume of the pipe instead
of the whole pipe by sliding it at the middle/back instead of the front?
Harry Pasterzak made pipes like that 25+ years ago. Here's an xray
view:
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