I have used Powertracks off and on for over 25 years. I started a project on version 2015. I do have newer versions but I like this one. After not using it much in the last year and 1/2. I found that I have forgot a few things. One, is how do you make a MP3 of your the finished project. The other is, how do you make program changes and other changes to individual tracks.
Thanks in advance.

Things have changed over the years, but from memory ..
MP3 - in 2015 maybe try export to compressed, or save to compressed, something like that, then you have to pick MP3 as the format

Program changes - click the 'E' icon for Event list, you can edit any event in any way using that.