pe reivers

whenever I work on reeds for tuning, I trumpet shape the intake duct toward a shape about 1mm inside the reed outline, just like in 4-stroke valve tuning. That way I have max reed operating pressure, max flow area, and lowest flow velocities at the reed circumference. These velocities tend to shut/restrict the reed valve due to Bernoulli effects.
These effects also can be used to direct the main flow path if required, without restricting the flow like a baffle would do.