Find a similar pad sound in any synth. You just have to go through preset banks until you find something similar then you tweak it out.... It takes forever to program synths from scratch, its a waste of time. Find where sounds are and remember thir locations. I'd reccomend NI FM8, NI Razor, Tone2 Gladiator, Tone2 ElectraX, NI Absynth, NI Massive, ro even Sylenth 1. After you find a similar sound just play with the portament settings. Record the chords you want, export the loop, chop it at each chord hit, and throw it in a sampler.