There are two basic sounds you'll need. The first is a generic "rock organ" sound for the choruses, and a simple synth patch for the little keyboard riff. Unfortunately, the NE5 doesn't have a synth section, so you'll need to look through the Nord Sample library to try and find something similar. You're looking for a basic pulse-wave patch with a piano-like envelope on it, nothing too fancy. Add a bit of chorus to finish it off.
Personally, I also play along with the verse chords with a general chorused piano sound just for something to do.
Edit:
1. For the organ sound, first select B3 Organ Model.
Then switch on the Leslie simulator: select Rotary in the SPKR/COMP part of the Effects section.
Add some overdrive buy using the DRVE/COMP knob in the same section. Try setting it between about 3 and 6 to start with.
Then set the drawbars to something like 688855000 to start with. If you need it closer, try starting with 6888 and then fiddle with adding some of the higher drawbars to taste.
(No VIBRATO/CHORUS or PERCUSSION necessary).
Use plenty of Rotary Slow/Fast switching for dramatic effect
2. For the Synth sound, try "Fat Clav" on this page:
http://www.nordkeyboards.com/sound-libr ... -2-0/synth
and add some chorus to thicken it up.
