Having a severe cash flow problem at the moment, while I would like to try this, buying a new ipad is out of the question.
But I see on cex (UK 2nd hand store) , I can buy the following.(with a 24 month warranty)
Ipad 1 32GB Wifi £75
Ipad 2 16GB Wifi £155
Ipad 2 32GB Wifi £165
Ipad 3 16GB Wifi £175
Ipad 3 32GB Wifi £200
Ipad 4 16GB wifi £215
Ipad 4 32GB Wifi £230
Ipad Air 1 32GB Wifi £240
Ipad Air 2 16GB Wifi £265
Ipad Air 2 64GB Wifi £300
Ipad (2017) 32GB Wifi A grade £300
Ipad (2017) 32GB Wifi B grade £270
etc etc
All the above are B grade except for the one labeled A grade. They also have C grade versions of all of them cheaper.
A grade - Product in mint/new condition with original box and all original accessories.
B grade - Product in good condition with all essential accessories. No box required.
C grade - Product in poor condition and fully working with all essential accessories. No box required.
If I want to use the ipad just for music, ie Metagrid and maybe a few of the synths, would going for an ipad 3 or 4 be a good choice, or am I likely to be buying something that new software wont be able to run on? I presume going for the 1 and 2 versions is not a wise choice?
For the next few weeks finding £200 will be hard, but probably doable 
Many thanks