To be honest, if you actually follow the Isone guide regarding HRTF, it results in a much better more rounded sound than any tweaking with Sheppi.
Tried all the combos, yes, increased depth but really doesn't sound natural at all. If you've configured the HRTF section of Isone right, you know you have as it sounds 'natural' to you and the extreme right and left sounds are parallel with your ears.
Imaging is more important than soundstage. The best sound is where you don't need to worry about the sound.
Edited by chinesekiwi - 6/15/12 at 6:25pm