This will be the entire process for hosting your mp3 library:
1) Download, run Katipo app on mac
2) enter url: katipobrowser.com/installWaraki
3) run the installed waraki host from the hosts tab in Katipo app
4) Choose your music directory
5) Download, run Katipo app on iPhone
6) Enter url: waraki
7) It finds your host running on the mac, connects, you can start building playlists, playing music
8) Quit Katipo on your mac once the music has synced across, start it again to sync changes