This app stopped working with Audiobus back in Sep 2014...and without Audiobus this app has zero functionality. Its now April 2015 and although IK Multimedia promised a fix at the time, their customer support recently told me they are "focusing resources elsewhere", so dont expect a fix any time soon.
Dont waste your money buying an iRing, youd just be flushing $24.99 down the toilet.
IK has lost me as a customer about iRing Music Maker