Is there a reasonably priced and reasonably usable DAW or audio editor with multitrack capability available for iOS 9? I am trying to get a fairly young person set up to start experimenting with home recording, and the only hardware she has is an iPod Touch 5th Gen. Or at a push she can also borrow her mum's iPad, but that is also limited to iOS 9. I live a long way away from this young person, so I can't myself get hold of her iPod to browse the apps available on iTunes. Am I also safe to assume that any USB audio interface that is marketed as being compatible with iOS should work with this version of the iPod Touch? Or should any USB audio interface that conforms to the USB audio standard work, even if it's not marketed as being iOS compatible? And what kind of socket is the USB port on the iPod Touch? Is it the same as on current iPhones? Would her mum's iPad have the same kind of socket? I just need to know so that I can get the right cable to connect an audio interface if I go that route. Please forgive me for asking what must be fairly basic questions, but I haven't used Apple products for a long time so I'm a bit out of touch.