Interesting. If I'm looking at this right, with all reeds being the same, it already has a variable valve of sorts built into the design. The inner reeds being the ones that provide the most flow throughout the rpm. I'm curious as to how the motor's volumemetric efficiency would change if the incoming charge was redirected to the outside reeds at lower rpms and brought inward as the R's increased. There's always the area behind the reed retaining screw that I see as being problematic but with the right velocities, it's possible that you could get a stuffing charge that would be resistant by a millisecond to the pressure signal of the compressing primary charge. I would venture to guess the motor would be very throttle sensitive but I can't say for sure.