Sorry if this has already been posted, but the search function is currently broken.
I'm using Rockbox on my 4GB iPod Nano and it works great. However, the bass boost seems to cause clipping on many songs. I thought I've read somewhere that Rockbox avoids clipping by limiting the volume according to the bass setting, but the distortion here seems to be independent of the volume. The bass & treble boost are the only things I've changed about the sound settings, the EQ is off and the songs that clip don't have replaygain tags.