Steinberg has an iOS app! Big news to both me and Steinberg apparently, as they have issued the first update for it in a year.
This loop arranger seems to have a great design with a lot of features and functionality, but absent from those is the ability to import your own! They want you to buy theirs in the In-App Store.
Today's update does add the ability to record and export though!
Despite the IAP-money-grabbing forced cripple, this seriously looks slick as hell. It is at least worth checking out the tutorial video.