You enable sound in the Developer by selecting a few settings on the Options dialog box accessed from the Tools menu.
Sound settings are located in the Recorder categories:
Sound Recording: Use these options to control how sound is recorded with a topic.
Record sound with topic: By default, the recorder is not set to record sound with a topic. Click this option to enable sound recording on the Recorder. The display of the Recorder depends on the state of this option and the Screenshot capture mode (Automatic or Manual). See Recorder Logic for more on Screenshot capture mode.
Note: This setting can be overridden on the Recorder at the beginning of the recording session.
Pause Sound recording key: By default, the Recorder uses the PAUSE key to pause sound recording for a topic. If the PAUSE key is difficult or inconvenient for you to use, you can change the Recorder sound pause key. You can use any of the function keys, or a combination of any of the function keys (F1 through F12) and the ALT key, CTRL key, and/or SHIFT key.
If you change the Sound pause key, you should select a key or key combination that is not used in the target application for another purpose. For example, pressing the F1 key in some applications opens a Help window. Therefore, for those applications you would not want to use the F1 key to pause sound recording.