Once you have your edited audio, you may want to add a backing song underneath the podcast, along with sound fx. This post-production mixing will require blending together all of the elements to create a cohesive and solid product, one that sounds as professional as you want it.
To achieve this, the mixing will involve level balancing, gain staging, equalization, compression and a whole host of other signal processing treatments to get your audio sounding amazing everywhere it is played. Remember when audio sounds great, more people tune into listen. It is very difficult to compete in the audio marketplace without solid quality control of this kind.
You have heard commercials where the narrator is speaking over a jingle. If you have a song in mind, but it is a 2-Track, or a mastered song, this mixing can still be done. The strategy here will be to carefully allocate frequencies in vocal audio that are not similar to the song, so that the audio will cut right through for clear intelligibility. The result will be both dramatic and musical, and neither audio element will suffer.