I never noticed it before, but now, when there is silence either in the beginning or end of an mp3 song, there's a static-y sound. I only picked it up today. It's really noticeable, so I don't think it's a bitrate thing, since I never heard it before. I have a CycloDS v1.13 with a MIJ Kingston 2GB. I will check if this happens on an R4 and on the computer when I have access to them again.