3-speeds
I've been working extensively on my clutch because it is so hard to get adjusted just right so that it engages the correct speed and is quiet. I've been experimenting with different types of rubber/plastic tips for the sodenoids. The original soft rubber tips had rotted and came off. What I can tell you is your 4th speed is the slowest of the ones you've described. The toggles will only energize 1 solenoid at a time, never both. I suppose one time I will do both just to see what the 4th speed is like. Definitely will be a handwash speed because 50 OPM would be really slow.
Anyways, awesome machines and a lot of fun when they work!
Jon