dual boot Volumio + Openelec

Hi, I’ve used raspbmc since I bought my pi but lately I’m a little bit disappointed about performance and sound quality.

I use the pi as a media center and the best solution would be a dual boot system with openelec and volumio with NOOBS.

problem is I googled a lot but I cannot understand how to prepare a volumio image for NOOBS and the wiki is too technical for my knowledge

I cannot find a detailed guide so I’m asking here if someone succedded in dual boot and can help me doing the same.