Sequencing Sfz??

[Tikiman]

I'm using the m-50 for a show and sequencing a bunch of the missing orchestral instruments. I'm trying to create a sfz moment and I can't figure out to do it...

I would use the volume pedal and just do it physically, but its a moment when the strings and reeds hold full volume and just the brass does a big fp..

Anyone know how to edit a volume within a track not the entire track itself?

Thanks!