Dual booting with the recent version of NOOBS and RuneAudio is fairly easy. Compared to some other pre-baked distros, RuneAudio is well behaved in a dual boot setup. I have been testing dual booting the most recent 0.4-beta version using a Pi2 and NOOBS Lite v1.9.1. For anyone who wants to give it a try, here is a link to a zip file containing the install files:
https://drive.google.com/open?id=0B3kaW ... 0cwUml3djA
If you are not familiar with NOOBS, please read the pdf with my notes, or just the NOOBS pages on the Raspberry Pi web site, this can save a lot of frustration (really):
https://drive.google.com/open?id=0B3kaW ... VUxTnVCdlE
The install file is a single .zip file which contains everything you need to put on an empty fat32 formatted SD card. The contents of the zip file are copied to the root directory of the card, there is no "flashing" the card with the OS image. The NOOBS installer does the rest.
edit:
The links above are to Google Drive. To download the zip file or the pdf file please use the download icon at the top of the page.