Does anyone familiar with Rockbox here? Actially the Rockbox is a replacement firmware which is compatible to most of the digital music players and it is free. This firmware is capable to run wide range of players. On the Stable ports list SanDisk Sansa Clip is listed but the Sansa Clip Zip is listed in Unstable ports. This means the Rockbox capable to run on these players but might be incomplete and give problems which will be going limit advanced functionality.