Im thinking it might give a nicer sound if I sent everything to a crossover, and sent all the high tones to the leslie and the low tones to the main speaker.
Only time for a quick response to your post. Don't do this! Not unless you want all your reeds, strings, pianos, rhythms etc to go through the leslie! low tones all go through the main speaker anyway.
Best of luck with getting this one back to life.