Igor Vasiliev has updated their FieldScaper - Field recorder & Scapes constructor app for iOS to version 2.2. They say:
FieldScaper is an advanced field recorder combined with a sound warp engine and a collection of ready to use dynamic presets for iPad and iPhone. It is designed to help a user discover new ways to create and construct unusual and exciting sounds from any environmental audio recordings or samples recorded from other apps through Inter-App audio or Audiobus.
This update improves compatibility with new devices with different aspect ratios and compatibility with new versions of iOS. Also added support for Bluetooth MIDI controllers, the sound engine has been slightly optimized, and the description of the app has been updated.
This app still works on previous generation devices starting with iOS 9.0 like iPhone 4S/5/6 and iPad 2, iPad Mini / Pro 1st generation.