I do horns a lot when I'm doing soul and r&b gigs. The easiest thing to do is octaves. Having flexible sounds is really helpful. On the Motif, they have horns with the fall off after you release the note, Horns that crescendo, etc. If you're really serious, get a breath controller then you can control the dynamics and articulations with your breathing like horn players do. Oh, for me having a board with synth keys also helps. Not sure if any of my babbling is of any assistance to you or not. 
Correction my friend..1st of all, U were not babbling!! 2ndly, the stuff is really useful

I had octaves at the back of my mind because, yes, they're the most common.
A board with synth keys is certainly the best in this case..I can't imagine what it'd be like using a weighted keys board to do this stuff

Please explain to me what a fall off is? could it be that sound that sounds like the voice is bending even though you haven't used the bend on the board?
Well i do do octaves (doodoo...funny
)
I am really interested in that breath controller thing you mentioned. Is it like a pedal you attach to the board?
I should quit this place before your character is merged onto me!

I like synth sounds for certain songs I compose or when doing solo's. Remember I'm just learning to play gospel so when playing more of a jazzy sound you tend to use a lot of the sound patches on your board.
With the guitar you will need to use the pitch bend to get more of an authentic sound.
Musallio you need to listen to Boney James, Kirk Whalum, Marion Meadows, Everrette Harp and Gerald Albright just to name a few for a more contemporary sounds. I really don't listen to Kenny G.
Thanks for the suggestions MrAndrew..
I do listen to Boney James & Kirk Whalum..am always on the lookout for their latest releases...
I also listen to a handful of other South African jazz artists, most of them are guitar & bass..
Jamey Aebersold's website provides a comprehensive list of recommended jazz artists to listen to for various instruments:
Here are the
Suggested Listenings .