Can I show presentations online with adding background sound?

Follow the easy steps below:

1. Click "Import->From PPT" to add PowerPoint file, you can also insert images between the slides;
2. Set Flash effects, click "Import Audio" icon to choose sound file from your computer, or just click "Start Record" icon to record sound directly (you can add different sounds for each slide);
3. Click "Publish" to output slides with defined flash effects (you can click "Preview" to view the applied effect before outputting).

You will get a single folder (contains HTML file, SWF file and a files folder) under your defined path, open it to view the HTML flash file.

About uploading your create flash file to your website, please view details here.