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There are 4 conditions that will cause COP to ask you if you want to compress the file:
If one or more of these conditions occur, you may be presented with one or more following options:
Compress to Audio Production Quality
: is offered if the book is recorded at a bit rate higher than 128 kbps.Compress to Standard Talking Book Quality
: this is the most common option and is offered if the book is smaller than the above rate.Compress to Acceptable Talking Book Quality
: is offered if the book is smaller than the above rate.Compress to Minimum Talking Book Quality
: is offered if the book is smaller than the above rate.
The most common option will be Standard Talking Book Quality
.
If you are presented with one of the above options:
Will Compress to [blank] Quality
Here is a video tutorial on How to Compress a File for Export.
Audio Production Quality
if there are special effects or music throughout the tracks. If there is only music in the Title and Sign Off track you can compress the file to Standard Talking Book Quality
. If in doubt, ask.