Imagine a jazz horn line. You have a couple of trumpets. Maybe a trombone. And a sax or two.
I'll use the C chord as a reference here.
Trumpets are the heart of the line and can play a triad. A good jazz voicing is the the 3rd(E) and 7th(B), or minor 7th(Bb). This is called a "shell voicing". Leave out the root (I,C) and dominant note (V,G).
Trombones can play supporting notes like the 6th(A) or 13th(A - up one octave).
Saxes can play in unison with the trumpets to give the chord some body. But in addition to that, I like placing a high velocity sax note an octave above the trumpets. It gives that screaming sax effect. Sax players are crazy.
Trumpets: E and Bb
Trombones: Low A
Sax: Unison with trumpets and maybe an E 1 octave above the trumpet part.