Why is there no audio effect on Sony Vegas 15 after rendering?

If there's no audio effect in Sony Vegas 15 after rendering, it could be due to several reasons. Ensure that the audio effects were properly applied and are active in the timeline before rendering. Additionally, check the render settings to confirm that the audio is included in the output format and that the correct audio codec is selected. Finally, ensure that your audio drivers are updated and that there are no issues with your playback system.