I would like the participants to see a moving cursor as the music plays and include a metronome "click" in time with the time signature.  This seems like the best way to simulate a conductor and choir rehearsing.  The mp4 video shows a cursor, but it moves with the rhythm instead of the time signature (sl. pauses at 1/8-notes in 4/4 time).  NotePad is better for my purposes.

As an alternative to NotePad, I would like to know how to include an audio file inside a PDF file as Peter Thomsen suggests.

I still think that a Finale NotePad playable on Mac and Windows systems would be the easiest option for virtual choral rehearsals.  Thank you all for your help...

Why can’t you send them a PDF and an audio file? Free, easy, and they don’t need Finale. They can even do it on iPads if they have one.

This may not be well known, but actually you can include an audio file inside a PDF file.

When you click to hear the audio, you will not get a playback cursor that moves along the music notation, but you can see the notes, and you can hear the playback.

Also, the PDF file is smaller in size than a corresponding mp4 video.

To see the cursor, you will likely need to use a screen-capture utility. This is not a request unique to Finale. The following link contains some references to capture programs that you may wish to investigate.

https://forums.steinberg.net/t/creating-dorico-videos/122482 

Please explain to me how everyone having NotePad on their computers will help in a virtual rehearsal.

… I would like to know how to include an audio file inside a PDF file …

You are using Windows, and I am using Mac, but try a web search (add Audio to PDF), and you will get lots of search results.

For Mike Rosen: You're correct - I don't need all the participants to have Finale NotePad resident on their computer for the virtual rehearsal - at the rehearsal I can use my full Finale program to project the music and play it.  The participants will see and hear what is on my screen.  However, I want to send each of the participants the Finale file (in v. 2012) ahead of the virtual rehearsal scheduled so that they can practice on their own time before the rehearsal.  To do this I adjust the volume on each of the voices - Soprano, Alto, Tenor and Bass so that one of the voices is prominent while the others are muted but still can be heard.  This way, the individual student can practice ahead of the rehearsal.  For that purpose, the Finale NotePad is better than mp4.  Not only is the lead voice prominent, but the cursor and Finale "click" allow the student to see and hear the music while rehearsing on their own.  I select English Horn for altos and sopranos and contrabass for tenors and basses.

During the virtual rehearsals, the volumes for each voice are adjusted back to give a balanced play-back.

I think that NotePad is a valuable tool for these sessions and its a shame that Finale seems to have abandoned that program.

I do exactly the same thing to create part-predominant audio files for the chorus. No one has ever needed more that that and either the sheet music or a PDF of it.

NotePad was abandoned for a very simple reason: no revenue stream. Chances of it reappearing? Zero to none.

A sort of parallel-universe use of this enhancement would be the ability to post our work to social media or websites, in a format where the score scrolls while the music plays. I took a course in Cinematic Composing through Berklee Online a few years back, and they were able to show the scores that way. I honestly learned more about orchestration that way than in any other method I've used. 

That said, there's a kind of painful workaround that (at least) doesn't cost you any money. You can use OBS to record desktop audio/video, set the view in Finale to scroll mode, and essentially just record the playback. It would work for what you've proposed, as well, but honestly I agree; the it would be fantastic if Finale stepped into the 21st century and added this feature.