Problem with audio

I was working on a project when the audio stopped playing back. The clips have audio, but no sound is coming from the sound wave bar. I'm not sure if I accidentally toggled a setting or something else, but even the video didn't have audio when I exported it. When I opened a new project, the audio was just fine. It is not muted, I've tried configuring my audio devices, I've even cleared the audio cache. Any suggestions?