“This is the trick Bruce Swedien used on the song Thriller for the horns in the intro. They’re a mix of real horns and a Roland Jupiter-8 brass sound, but used in particular way.
By the way, you don't need a Jupiter-8 to do it, it works with any synth that can layer two patches and that has separate outputs for each layer. For example, a DX7 IID has an A and B output.
“So here is the trick: instead of trying to layer different sounds, like a plucked sound with a long pad or something like that, just create a simple brass patch, and save it. Then, as the second layer, use the same preset you just programmed. Route one layer to the A output and the other layer to the B output. On a mixer, pan the A output left and the B output right. This will already sound really wide. Tweak and detune one of the two presets slightly and you'll see what happens. You'll get "the biggest pad you've ever made" according to Joakim, who tried it and loved it! “But he’s also got a Jupiter-8 so maybe the trick is just to buy one of those...”