Please, what ever you do just buy the Official Apple Convertor. A HUGE percentage of the 3rd party 30pin to lightening convertors do NOT pass audio & power and this is proved time and time again over at the NI forum.
As much as they are, the Apple convertors are worth the money.
Bad cheap, Buy twice.
BTW - It is clearly stated on the Z1 product page that the Apple 30pin convertor is required for iPad4/Mini. This should not be a surprise to anyone (even though it is annoying).
.........And for the love of GOD can people stop recommending that different methods of converting 30pin to lightening work because they don't. Period.