SonicCell would better be compared with the Ketron MidJay.
The SD4 does not have any audio file capability whatsoever, in fact they are two different machines with two different end uses.
IMO the MidJay beats the SonicCell and yes, I've had both here, SonicCell was returned, MidJay still here.
In other words, comparing SD4 to SonicCell does not allow for the same "common denominators" at all, two different machines with two different design purposes IMO.
--Mac
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"Keep listening. Never become so self-important that you can't listen to other players. Live cleanly....Do right....You can improve as a player by improving as a person. It's a duty we owe to ourselves." --John Coltrane
"You don't know what you like, you like what you know. In order to know what you like, you have to know everything." --Branford Marsalis