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Wish it was that easy!
The four channels on the X66 are;
1) Drawbars A
1) Drawbars B
1) Tab Voice Channel
The Leslie 925 is a single channel speaker.
The 9770 Kit accepts 4 channels and does main/echo with 4 channels but mixes down to 2 channels on its output. The 2 channels are Stationary and Rotary. The 925 doesn't have those inputs making it non-compatible with the kit.
Lastly, if you modified the kit and/or Leslie to mate, you would be mixing all 4 channels of the X66 down to 1 channel. There could be some phase problems not to mention having Tab Voices going through the rotary system.
I would think a 2-channel Leslie at the very least would be a step in the right direction. Keeping the Tab Voices separate from the Drawbar tones. There are still issues with routing the bass to the appropriate bass channel etc.
Like I said, wish it were that simple.