Tested with the M-32 we have here in the office.
My results was:
Note1 C5
Voltage1 0.000V
Note2 C6
Voltage2 0.994V
The frequency knob on the M-32 is at the centre mark.
The settings are individual but should be quite close to this.
The M-32 tracks very well within a few cents over 4 octaves.
As avantronica says the keyboard on the M-32 offsets the pitch. Play a C and keep your hands off it 
/Olle