I double checked my volume mixer and vegas pro has sound up as high as all of my other programs. When I play the video in vegas pro it shows the audio levels going up and down to show that sound should be happening. I went into preferences > audio device, then selected windows classic wave driver and made sure that all my default playback devices were the correct audio output which I double checked. When that still didn't work I plugged my headphones into another audio source and switched everything to that but it still didn't work. I also tried uninstalling and reinstalling. I have used sony vegas editing software for many years now, and I took a week off of it then came back and it just doesn't work with sound. I didn't change any settings so I am very confused.