How can I use a sound file on one slide, which fades to another sound file on the next?

Question

I am trying to make a slide show that begins with a certain sound file, which then I hope to fade out to the second slide which uses a different sound file, I've followed Apple's online tutorials, but what happens is I get two sound files playing simultaneously. Also, I'd like to add sounds files to different individual slides throughout the presentation, which I want to play independently from the entire slide show's sound track. I have programmed the slides to change automatically. Is there any way I can have multiple sound files on multiple slides all playing independently, without playing over the top of the previous sound file? I imagine this is a simply task, so my apologies if this is the case. Thanks in advance for any help!
kind regards,

Answer 1

Getting sound to work right in Keynote requires a basic understanding that:
1. Sound played during slide transitions (from one slide to the next) must be placed in the Document Inspector > Audio > Soundtrack Well - there can only be one audio file and it plays across all slides
2. Additional sounds files can be placed on individual slides as sound objects - each object can have build-in and build-out assignments, but sound files need at least a Build-In > Start Audio (done in the Build Inspector) - each object, wether a shape, image, sound or movie can have discrete start timing such that the start of one sound object can be delayed X seconds after the previous event. This can be used to avoid overlapping starts or playing. If you know the length of each sound file object, you can adjust the start to occur after the end of a previous sound using the Build Inspector. Click on the More Options Button to display the event build-order list and click on the event to reveal how the build starts and add any delays to start there.
3. Keynote does not have a Fade Feature - any fade-in or fade-out (sound up/sound down) of audio files must be done to the sound file using third party applications and then brought into Keynote. If you'd like to join the crowd wishing Apple might add this feature in the future, you can provide feedback to Apple here:
http://www.apple.com/feedback/
4. If you need an audio file to play across a few slides and another audio file to play across another few slides, break the presentation into seperate documents, place the audio in the soundtrack well for each document and then add a hyperlink object to connect to the next Keynote document in the series. Note: all files must be "opened" in the background and ready to play or else the next file will attempt to start but stall just when you don't need it to.
Hope this helps.