Don't bother. – iAudioGate Review

Korg lies. This software does not turn your iPhone into a hi res audio player capable of DSD output like they lead you to believe. You need an external DAC for that. Korg has stopped producing such hardware, so you are on your own. An entry level DSD DAC is the iFi Nano-iDSD. Without hardware you might as well stick with iTunes, since there is no difference in sound quality if you don't compress you files. (Heaven forbid.)
Review by Shallel on iAudioGate.