Look at your std lead pipe, look where the main tuning slide
INSERTS into the lead pipe. On a reverse lead pipe, the
relationship is opposite, i.e. the tuning slide is "female" and
the lead pipe is "male". The benefit is a more continuous taper
and moving the air flow disruption of the joint farther from the
mpc. This results in a feeling of more free blowing, less
resistance, and some claim a noticeable difference in tone
quality.
Larry Woods
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