URGENT: Triton Le + Roland Prelude MIDI [program change]

[SunBlack]

Hi all,
i've a Triton Le which i use as master keyb and a brand new Roland Prelude which i use as an expander.
Even if i set Program Change off on my Triton LE [on MIDI Filter 1-4 options) and on the Prelude ("System" menu), on resettting the countbar on the Triton sequencer or changing page on "part view" on the Prelude, the sound i preselected on the Prelude is resetted, changing on default sound.
How resolve?

Maybe answer is here? :
on page 127 and page 130 of the Parameter Guide of the Triton
Triton, there is "GLOBAL 2.1: MIDI," it is here where i could act?
Or on page 62 there is the possibility in sequencer mode
to set the data LSB and MSB of Roland Prelude voice.
Again, where i can set Program Change value of Roland Prelude voice on the Triton?

Since I'm here, there is the possibility on the Triton
transmit data of the volume of the track
shared with a prelude (solution on page. 56-225-234 -
238?)?

Thank you!