No audio when playing assets on timeline.
Confirm that your program is properly set to play the audio of the video clip you're using.
Import a video clip to your Timeline.
Right-click the video on your Timeline and make sure that in "Active Streams", both Video and Audio are checked.
After doing this, if the audio is still not there, check the volume of your program from Windows' volume mixer.
Right-click the speaker Icon at the system tray of your desktop then choose Open Volume Mixer.
From there, you can see that Pinnacle Studio has its own Volume adjuster. Ensure that it's not on mute, or it's not set at its minimum.