When you change the velocity (volume) of a single note by right clicking on the note and selecting "edit note", does only that note change, or is the velocity of subsequent notes also changed ?

I know when you make a change to a bar, all the bars from there on are changed.

In answer to your question: Yes, only the velocity of that edited note will change. This can also be undertaken in the Piano Roll editor.

Note however, if this is a RealTrack then it is likely that the track will be replaced upon a new generation. The MIDI data for RealTracks is only a transcription that shows the notation.

Are you using MIDI or RealTracks?

The notes I am trying to change are MIDI. But there is a realstyle accompaniment.

How do you change velocity in piano roll? I see a drop down menu for velocity but the selections are puzzling.

Edit : I found a 2013 video that show how to edit velocity in piano roll.

Thanks so much for the information!

Glad you got it sorted out.
Thanks for letting us know it's now OK.