We recommend uploading files in bitrate that your account allows for. For instance, if your account allows for a bitrate of up to 128kbps, then we suggest uploading files at 128kbps and a sample rate of 44.1khz (44100 Hz) STEREO, and in mp3 format. Our system is not designed to run off of anything else other than 44.1Khz Stereo files (for 128klbps files. 22050kHz for 64kbps files), and as a result, any other settings might fail. Files that are uploaded differently thank what you package allows may not be supported.
Updated: March 7, 2013