Help with Sforzando MIDI effects

[SEPTember]

Hey, I'm using Unreal Instruments' Metal-GTX soundfront in Sforzando and there are these custom slides you can put on your guitar MIDI. My first question is if this is the correct place to ask about this. As for the real question is how could I make it so that an effect would play later in the note without cutting it short and starting another sound, breaking it. Perhaps there is a way to blend them together? Maybe delay the effect's start? Particularly I want a guitar sound to play and end with it sliding to the next.