Bert,
This just needs some testing. I'm not thinking it will ever be as precise as a solenoid fuel control but I do think the setup and concept might allow for a "simpler" setup for the majority gas conversions. The midrange effect seems predictable and strong - Less so on the top end, and very pronounced down at low throttle settings - but it did react exactly as I had predicted. It might also have an application on the "walbro" carbed gassers, where mid range richness is a common issue.
My plans are to build a more precise valve (still simple) and get it working on a curve from the radio. I have a Magnum 91-4 stoke getting cleaned up as a planned conversion test mule.