I have also requested this audio/slide time synchronization feature for the song mode. But until the programmers get to it, there is another RELIABLE way to sync using PowerPoint. This may be too complex for some, but here goes: ( a lesson in PowerPoint and more! )
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First, I import my sound track from my electric piano or any other source to become a .wav file in "Audacity"(very good and free) program. There I can rework it, (slow it down, speed it up, change pitch, sometimes remove vocals), etc. Then I export it out of Audacity to become a VLC file in my designated folder.
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Next, use Open LP song mode to build the lyrics slides and background that you will use for the song.
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Next, open each slide to full screen view and use Windows Snipping Tool (full screen option) to take a photo of the slide and save it to your designated folder. Once all song slides are in correct folder, open them using Windows Photo Gallery to "crop" them to perfection.
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Now you are ready to work with PowerPoint. Using the "insert" tab, enter all slides for the given song in their chronological order. Some slides may be used two or three times in order to conform to the audio track. Before setting up slide order, you will want to set the aspect ratio to conform to your screen.
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Once slides are set, use "insert" tab to import audio track from designated folder. Once audio track is in the PowerPoint file, PowerPoint will ask you if you wish to trigger the audio "automatically" or "when clicked". Press "when clicked". Now important: you must click on the "animations" tab and look for the small "animation" window. Click the down arrow of this window to open a drop down menu. On the drop down menu, click "play through slides". This will allow your audio track to continue playing while slides are changing.
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Next, highlight your first slide, click on "Slide Show" tab, and look directly below tab for "rehearse timings". As soon as you click on this, your screen will go black except for a small window at top left and the audio track will begin playing. In the small window at top left you will see a small white arrow pointing to the right. While listening to the audio track, click on this arrow to advance through the consecutive slide order (according to the timing of the audio) until the audio track is finished. As soon as the audio is finished close this little window. This will return you to the PP file you have just completed. Name it and Save it to your designated folder. Then open "presentations" in Open LP, click on "New" and import your completed PowerPoint file to the presentation list. When sent live, these PP files will open right away to the first slide and begin playing the audio track. So you should place an image file in the service manager before and after these PP files. If you do not touch the up/down, right/left buttons during the presentation of the song, the audio and slide advance timing will remain constant and reliable. Good luck!