Select Sequence, and one of the following options:
- Render Effects In to Out: Renders the sections of the video tracks lying within the In and Out points, containing a red render bar. Alternatively, use Enter.
- Render In to Out: Renders the sections of the video tracks lying within the In and Out points, containing either a red render bar or a yellow render bar.
- Render Audio: Renders a preview file for the sections of the audio tracks lying within the work area.
By setting this audio preference (Render audio when rendering video), you can set Premiere Pro to render the audio tracks whenever you render the video tracks.