HD I/O calibration question

[jbreher]

I am wanting to calibrate my HD I/O. I am trying to follow the instructions in the user guide, employing the (admittedly possibly modified) template 'Calibration Session (8ch)' found in the '/Applications/Avid/Pro\ Tools/Pro\ Tools\ Utilities/Calibration\ Mode\ Sessions/HD\ IO\ Calibration\ Session' folder.

The process seem logical to me. My confusion: upon opening the Signal Generator plugin, the settings are:
Sine (good)
Frequency 1000Hz (good)
Level -20.0 dB (I'll change to -18, as I'll be rock focused)
Mode: Peak (WTF!?)

Should this not be outputting my cal level (-18 dB) RMS, rather than Peak? I'll be trying to hit 1.228 Vrms at each output, not Vpeak, right?

I don't know the entire history of this session template. Someone may have modified it from RMS to Peak. But I would have expected it to come up RMS.

Can someone resolve my confusion?