Pan / Stereo

try panning stereo tracks a little different then hard left and right,
try f.e. 9 and 2 o'clock

instead of using 'fake' stereo fx like chorus on a mono source (most keyboards work this way),

• try splitting the mono and add a slight delay (10 - 20 ms) full wet (no feedback) to one of them
• while topping off some high end.
• and detuning it a bit

instead of 1 double delay of 3/16th on a stereo track, try using 3/16 - 1/128th for one side and 3/16 + 1/128th on the other