Rotary is one of my favorite sounds. I don't remember the first time I heard it, probably on a George Harrison or Eric Clapton song, well before I heard Frampton use it. Anyway it's almost always in my presets, and, like you said, it's a replacement for the Chorus block, especially when running into a stereo rig. Having it in the modeler instead of a big, very heavy, cabinet is wonderful.
It seems like Leslie's cabinets ran at varying speeds, and definitely other manufacturers used different speeds, but, based on
Wikipedia's article on Leslie speakers, I went with 50 RPM for the slow ("choral") speed and 400 RPM for fast ("tremolo"), or .833 and 6.66 respectively in the Rotary block's A and B channels. I also use 0 for the rate to give me a brake/stop setting on channel C. (50/60=.833 and 400/60=6.66)
Then, on my enable switch on my foot controller I set the hold function to increment from A to B to C then wrap back to A, letting me use one switch to turn it on/off and to switch between the speeds or brake. It works well, but takes a little getting used to when wanting to switch from fast to slow because I have to step through the brake first. It works because of the way the speed ramps down, so two hold presses sounds like I've gone from fast to slow without fully stopping. The custom label for hold is showing what the next press will do, so starting on A, the next press is Fast, then Brake, then Slow.
View attachment 86478I like your other settings more than what I was using, so here's a blend of my RPM settings with yours.
