Aloha J,
I have not seen a tablet that can run a full Cubase programme
but some approaches would be an app like Cubasis.
or
GarageBand for iOS
Also I believe Steiny has announced some Android stuff shipping soon.
(But that is just for Cubase iC Pro!)
Which means to me tho’ that they definitely looking in that direction as well.
Stand By.
{‘-’}
BTW
Apple’s new 64 bit A7 chip does seem to have the power to run an app like Cubase.
A user can get 32 tracks in Garage band now. (however with no ability to run 3rd party sound sources/plugs).
Yet!
And not enough memory in these machines to take full advantage of a 64 bit architecture.
Yet!
Also Stand By.
And if it is just a digital quality stereo recording, also consider a simple hardware device like the Zoom.
http://www.samsontech.com/zoom/products/handheld-audio-recorders/
{‘-’}