I found this last night searching for schematics after I posted the first question. The second one has a 1k potmeter like Sebi suggests, but also some extras. Does it look like a good plan for a speaker line-out?
"Run the hot for your line out through a 100 ohm resistor and 10mfd/50/NP cap in series...resistor to the "G terminal.....place a 100k resistor to ground from the end of the cap. The junction of the cap and 100k resistor is your line out.
100 10 uf
G o----/\/\/--------] [---+----o line out
|
/
\
100K /
\
/
\
|
=
gnd .
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Another suggestion, incorporating a potentiometer, so that the (fairly hot) output of the Hammond can be padded down a little:
1K 1.0 uf
G o----/\/\/--------] [---+
|
/
\
50K /<---o line out
\
/
\
|
=
gnd .
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Why the Capacitor?
In the above circuits, I'm not sure what the purpose of the capacitor is. If I had to guess I'd say it's to protect the organ's output transformer from errant DC (from a faulty "input").
I'm pretty sure the above circuits will work fine without the capacitor as long as you're careful about what you plug the line out into. (E.g., don't plug the output into a power supply.) "