Some users have reported the following confusing behavior when opening older songs in Version 9. The Port assignments on some or all audio tracks have been
accidentally changed so that the audio tracks are now assigned to play on different port(s) than before. This accidental reassignment of audio ports happens more with
some audio drivers than others. You may not experience this at all, but in case you do:

1.Open the song in Version 9.
2.Inspect each audio track in the project and verify that the track is assigned to play through the desired output Port. (Look in the Port column in the Track View).
If necessary, manually adjust the Track’s Port setting to the desired port (using the Track Properties dialog). Then save the file.

This fix is a one-time operation. Once you've corrected any incorrectly assigned ports and saved the file in version 9, you won't see this problem anymore. It only
occurs when opening older files for the first time in version 9.

For example:
The audio track in your song was previously assigned to play out “Analog Out 1/2” but when you open the file in version 9, you find the Port set to “Analog Out 5/6”. Set
the Port to “Analog Out 1/2” and save the song to correct the problem.