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If you've ever tried to export a number of songs from your normal digital audio workstation timeline, you know that what you get is a single large file instead of individual song files, like what we're used to on a CD. That's because you need a special editing workstation for making CDs that does what's know as PQ subcode editing. PQ subcodes control the track location and running time aspects of a CD, enable the CD player to know how many tracks are present, where they are, how long they are, and when to change from one track to another.
Editing software applications like Waveburner, Audio Architect, Peak, Wavelab, DSP-Quattro and Sound Forge, all have the ability to place these codes as needed. When the CD was first developed, it had 8 subcodes labeled P to W, and there were a lot of uses intended for them, they just never came to pass. Today the only subcodes used are P and Q, but these contain other information like ISRC and UPC codes and CD text, all of which we will cover in future movies.
Most PQ editors also allow PQ log to be printed out which is then sent with the master to the replicator, as a check to ensure that all the correct data and information has been provide. The ability to add a PQ code is essential in the process of creating a CD and only certain apps are capable of doing this. That said, an app with the PQ editor can give you much more power and precision than you ever thought possible on a CD.
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