If you import a stereo audio file into your Engage '09 interaction and find that the volume level is lower, quieter, or softer than expected, the left and right channels of the audio file may be out of phase. A stereo audio file that is out of phase will not play properly when it is imported into Engage '09.
How to determine if an audio file is out of phase
- Open your audio file in an audio editing program, such as Audacity (which is a free tool).
Zoom in to view a small section of the audio waveform.
- If the left and right audio channels display exact opposite waveform images (mirror images), as shown in the screenshot below, then your audio file is out of phase.
How to correct an audio file that is out of phase
- Open your audio file in an audio editing program, such as Audacity.
Split the stereo track, so that each channel can be modified independently of the other.
Invert one of the channels.
Export the modified audio to a WAV or MP3 file.
Here is a video screencast of this process using Audacity:
How to replace an audio file in Engage '09
After correcting your audio file, you can replace the out of phase audio file in your Engage '09 interaction in this manner:
- Open your interaction in Engage '09.
- Select the step, tab, or segment that contains the out of phase audio file.
- In the Audio section, click the speaker icon to open the Import Audio File wizard.
- Browse to and select the corrected audio file, and click the Open button.