For optimal results, we recommend you send us your tracks as lossless audio files, such as WAV or AIFF formats. Each track should be clearly labelled, and it’s best to avoid applying effects or compression, unless they form a crucial part of the sound. Tracks should be exported at the same sample rate and bit depth at which you originally recorded them. The industry standard is typically 24 bit and 44.1 kHz. These specifications are required for Apple Digital Masters.