If
you are recording audio for a presentation, you can either use a
microphone or the lineāin option that is usually included with an
external audio device such as a tape deck or stereo amplifier.
In PowerPoint, open a presentation (PPT file).
From the Adobe Presenter menu, select Preferences.
Select the Audio Source tab.
In the Audio Input Source area, select either Microphone
or Line in.
(Optional) Select the Always Prompt to Set Microphone
Level Before Recording option if you want to calibrate the microphone
before each recording session. This is useful if you use different
microphones or if you record in different environments (for instance,
a quiet room versus an area with background noise).