Yeah what about carb tuning.
They've had these sorts of rigs for cars for many years.
A simple tunable baffle is the old "lollipop". You get a washer that fits in the pipe, and weld a bolt to it. Drill a hole in the pipe and shove the bolt throught it with the washer in the pipe and screw a nut on. Now you can turn the washer open or closed how you like. But this is just for loud or louder.
