Don't worry about the lack of memory socket; if you need the ram upgrade (for loading additional supersolo or ins sounds) then Ketron will be able to help you out. The Audyas 'user ram' is not used for anything other than supersolo/ins sounds. The Audya uses streaming technology and does not require large amounts of ram (like old technology keyboards)

I have been running my Audya with the additional ram for over a year (perks of the job) as I love the gorgeous vintage sounding Stereo Grand Piano in Supersolo, plus I have a few programs that use a number of ins voices at the same time and its usefull to be able to autoload all of them on power up.