I purchased my MZ-RH10 a few days ago and everything works fine. I Just have this minor issue. My PC Hard drive doesn't has much free space and in a few days i found that .oma files already took a couple of GB. The .oma are from a couple of large wav uploads that I have already saved in another folders so, can i delete those? Other oma's are from mp3 albums that i convert to HI-LP to transfer to a HI-MD, so I don't need those files. Can I just hit "del" or SonicStage needs those files to work fine? Thanks in advance for your help.