Richdobs,
Back on track. To answer your initial question, the latest version is the one with a stepped volume control. Been out about a year. There is also a version with less output impedence upon request from the factory for passive folks. There is a mod that Steven at Resolution Audio does that bypasses one of the coupling caps and some wiring by jumping them with Bybees at the output. This is even better than the lower impedence change from the factory because you are losing a couple of stages and gaining the incredible benefits of the Bybees right at the outputs.
That was probably more than you needed to know but maybe helpful to some others.
Back on track. To answer your initial question, the latest version is the one with a stepped volume control. Been out about a year. There is also a version with less output impedence upon request from the factory for passive folks. There is a mod that Steven at Resolution Audio does that bypasses one of the coupling caps and some wiring by jumping them with Bybees at the output. This is even better than the lower impedence change from the factory because you are losing a couple of stages and gaining the incredible benefits of the Bybees right at the outputs.
That was probably more than you needed to know but maybe helpful to some others.