We’ve followed the progress of the JoeCo Black Box Recorders - simple 24 Channel rackmount standalone recorders that use to standard USB devices to track and playback and come with a variety of audio interface options.
They now have an app which allows control of functions through the iPad interface. Including playlist ordering and creation, record and playback and much more. Available soon.
Handled automatic tuner gets you in key and keeps an eye on yr strings