I'm eagerly awaiting whatever further information S. K. Goodman will
publish about the "Ragtime" in-line valves.
In particular: Do they work best (or at all) in a certain position? It's
a lot easier to splice them into existing pneumatic tracker bar tubing if
they can be horizontal, vertical, or whatever.
Also, it seems they are unreliable, or at least need some Tender Loving
Care (user adjustments) before using. For a 20 or 31-note organ, that
may be tolerable, but it can't sound good to the 88-note and 101-key