PQ Codes

PQ Coding: PQ codes provide location and timing of each track and meta data (like track names) on the CD. The Compact disc contains a number of subcode areas and each area is named with a letter, from P to W. The key subcode areas are named P and Q. The mastering engineer performs PQ coding just before cutting the CD Master (CD-R one off).

How do you know you have successful PQ codes? Simply play the CD-R in a home stereo player (not your computer) and use your 'time display' button to see if it can read the song count backwards (eg: a song that is 3:26 in length will start counting down from 3:26 to 0:00 to indicate the end of the song). Also the 'time display' should indicate the TOTAL playing time of the CD. If your player does not have this display feature then seek out a higher-end player that does this. Also, use headphones to check your PQ codes vs. audio match. It is possible to make errors by placing the index at the wrong moment on the master since it does not affect the audible portion of the song. If you have a hidden track or your PQ codes differ from the artwork (CD jacket) please let us know by including notes with your master so we don't place your job on hold for fear of a mistake at our end.