Analogue-sequencer

Hi,

I'm new to this group and a new P3 user aswell.
I'm used to working with a software sequencer for a long time
just unpacked my P3 yesterday and started to get around

manual is very clear and I quickly learn to work with the P3
but there is one thing that I couldn't work out

some of my synths work in Omni mode
meaning they consume everything on every MIDI channel
this can only be turned off by a MIDI message called 'Omni off'

on my software sequencer I can send an 'Omni off' message within 'Mode changes' 
I couldn't find a simular function on the P3

so here is my question:
Is there a way to send an Omni off message on the P3?