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I got the remote working completely. You can see the remote chassis, and the mechanical aspects of how the remote works in the pics.
The color control wasn't turning because there was some gunk jammed in the relay for that control. The other remaining problems were due to mechanical issues. Because the remote chassis has its own power supply, it's easy to work on the remote stuff with everything up on the bench.
No matter which button you push, the gears behind all the solenoids turn. But only one solenoid will engage, corresponding to the correct control. So with 4 functions on the remote, there's 4 circuits each tuned to a slightly different frequency (hence the need for alignment), corresponding to 4 separate relays (with 2 additional relays to turn on the motor in either direction), and then 4 solenoids.
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