From the FAQ on Elektron’s own site (http://eu.elektron.se/support/?connection=analog-keys)
"Does the Analog Keys and the Analog Four sound exactly the same?
The Analog Keys uses the same means of analog sound generation as the Analog Four, but features circuits fine-tuned for delivering deep bass."
The video that sold me on a difference is :
around 3:45
Yes, it’s a youtube video and all sorts of reasons that it may be inaccurate sound, but… when I first that the first thing I thought was that my a4 desktop does not have that same saw sound.