Also audio mixing. It’s when we mix many sounds together. Let’s say that we have different tracks of audio and we want to listen to everything at the same time. We have to mix all the tracks together by manipulating each and every one in terms of volume, frequency, panoramic position, etc. Sound mixing can be done either with speech or music (well, with any kind of sound, really…) and is a really important bit of audio and audiovisual productions. See audio track and audio channel for more.