what are you wanting to do CW? the 3 speed is off,slow,fast.The original leslies were off/fast;the slow(chorale) came latter.Here's a cheap way to get all 3 speeds,don't think it would hurt anything.
Plug your 122 slow motors into an extension cord into a power strip.Turn power strip off;you have off/fast.Flip the power strip on-you have slow/fast.
The jazz cats use mostly chorale/off,with the fast for the ending crescendo while the gospel guys always flipping the fast switch.I mostly unplug the lower slow on my 122;think the bass is a little cleaner.
I like watching the gospel guys fiddling with the drawbars every 3 bars;a lot of times NOT the bars for where they're playing.Nervous energy