Normally the voice allocation mode is set to normal. That is every 1st note in a chord one hit the first voice is triggered, every second note the 2nd voice is triggered etc. That means the same voices are used all the time in a similar way. But different voices differs slightly.
There is a voice allocation mode (from firmware 2.0) that circulate the voices every time a key is hit: Round Robin Mode. That gives small nice variations every time a key is triggered and makes the P5/10 rev 4 soaring in a nice way.
Enable Round Robin Voice Allocation Mode:
1. Hold down BANK and press GLOBALS button once to activate Page 3 of the Globals menu
2. Press program selection button 2
3. Use the BANKS and TENS buttons (DECREMENT/INCREMENT) to set voice allocation mode to rr
4. When finished, press the GLOBALS button once to exit.
https://youtu.be/xtmC6gC4vrk?si=OVbQQrMwmwE139y0