Yes, it's a pretty hot output.
With measurement into a 10k ohm load with the triangle wave only on, mixer cranked, amp section sustain pot and output volume on full, I'm measuring a 3 dBm (893 mV peak-to peak) output.
For comparison, the CS-80 with the same setup has an output of 0 dBm (632 mV p-p). Setting the P10 Volume pot at 8 brings it down to 0 dBm.
In my experience it's hotter than most of the synths in the studio, but as long as it's clean (which it is), no problem!
EDIT: Thought I'd check the noise floor on the P10. On the CS-80 it's around -65 dBm, on the P-10 I'm getting around -78 dBm cranked. Very nice!