Audio doesn't extend over slides when using Impress to present a ppt slide show

I am using Impress on a Linux based system to present a Powerpoint slide show. There is a song embedded with the audio extending over several slides containing the lyrics. It works ok in Powerpoint on a Windows machine, but in Impress (either Windows or Linux) the audio drops out at the first slide change. I would really like to use the Linux (Raspberry Pi) machine for presenting, but the audio needs to work properly. Is there any way to work around this?

@JohnD49
Have you searched around in the ask site? You could have found this answer of @librebel here:

How to add music to an entire Impress presentation?

He linked to a “tutorial” of @acknak on Apache OpenOffice Community Forum - [Solved] Music files that will play over multiple slides - (View topic)

Attached you find two sample files in a folder in a ZIP container. Please note: The sound file is not embedded in the presentation file. Extract the entire folder of the uploaded ZIP file. The used sound file is free for use and not under copyright.

How to get the sound file from the Powerpoint presentation (if embedded)? If it is a pptx file, you may extract the sound file while opening the pptx file on a compression programme like 7-zip or any in-built app in Linux. You will find the sound file in some folder, I think.
If it is a ppt file, I see/know no way for extracting.
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Impress_SoundAlongMoreThanOnePages.zip (836.7 KB)

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EDIT
Working with the Media Playback toolbar
Source: Impress Guide 25.2 Pages 255f

You may work on the Media Playback toolbar as well. When using it you can embed or link the sound file. You will start music before presentation mode and it will indipendently run during presentation - even after leaving presentation mode. To show the Media Playback toolbar select the sound icon on the slide.
When you have left presentation mode and work on edit mode you can stop the music (or you let it continue). IMO this is a bit “underdeveloped”, but it works stably.
(To position the sound file in a master slide could be a good idea, but when changing the slides it started from the beginning again.)
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See attached Impress file with embedded sound file:
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Impress_SoundAlongMoreThanOnePages_EmbeddedSound.odp (841.6 KB)

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