Compressed file formats such as MP3, AAC, or WMA files are not accepted.*Do not send in your sessions with processes such as compression, limiting, maximizing, etc. on the stereo buss during mixdown. A master that arrives already compressed and or limited greatly reduces the ability of the engineer to deliver the best sounding master possible. Masters with excessive level, clipping or audible distortion may also prevent us from mastering your project to its fullest potential. Leaving 3-4 dbs of headroom during mixdown is a good rule to follow to avoid clipping and distortion on your master. If any of the above issues are found on your submitted master we may request that you correct the issue and submit a new master before we proceed. Things to avoid whenever possible:# Avoid normalization, sample rate and codec conversions such as mp3, WMA, etc.