Yes, correct, the midi signals coming from the NS 2 to the P6 can be adjusted to play the correct octave with the extern section. The octave setting on the P6 does not need to be changed. If you play the P6 keyboard, then it will reflect its octave setting. The NS2 midi tranmission appears to be based on the entire note range and ignores the P6 Octave setting.
-dj