You can't load the RealTrack like you show in the video (2nd part)

Here's how:

Right click on the track (lets say melody)
Choose Add/Remove RealTracks
When the realtracks screen opens there is a filter (bottom Left)
Type in harmonica then click on the Update button
You should see harmonica (notice you will also see the other RealTracks that are in your Style, if any)
Select the one you want
then, either select the close button (in which case when you return to the main screen you will have to regenerate the song)
or, Click on Generate Track.

Remeber if you have Freeze tracks on it won't work. Unfreeze them 1st.

Now I am assuming that you have the latest version, if not then I can't remember how the previous version worked (senior moment(s))

Have a look in the help file (PDF) and search for RealTracks.

Hope this helps

George

Windows 11 64 bit, Biab 2024 1111, Realband 2024
i7 Desktop Computer 16Gb Memory