There are three types of events that can be used to specify various sections of audio on the CD.
- Title start
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There can be up to 99 titles on one CD. Each is identified by its start point only.
- Title sub-index
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On advanced CD players, a title can be divided into sub-indexes (sometimes called only indexes). These are used to identify important positions within a title. There can be 98 sub-indexes in each title. However, because it is difficult and time-consuming to search for and locate to a sub-index, many CD players ignore this information.
- Pause
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A pause is added before each title. Pauses can be of variable lengths. Some CD players indicate the pauses between titles on their displays.