@mhenschel confirming your observation that my little diagram is wrong -- the signal identiification and pin numbers are correct, but I had indeed switched "shield" and "white".The balanced output connectors (CN1) aren't labeled, so I had to (gasp) squint at the circuit diagram to figure out how they're wired up. (It's V+/V-/Ground, or pin 2/3/1, FWIW).
The corrected summary: V+/V-/Ground -- pin 2/3/1 -- red/white/shield.
Thanks again for catching this, and I'm very glad I didn't connect it to my preamp this way!