In the audio recording of an opera, there are a series of characteristics that differentiate it from other musical recordings. On the one hand, we are faced with the requirement that the microphones are not visible either in the making of the video or from the stalls, which does not allow us to place the microphones in their ideal position, but forces us to hide them on stage and use wireless models for soloists. So, mixing and sound treatment will require a special technique. On the other hand, especially in live opera broadcasts such as those performed at the Teatro Real in Madrid, performances are recorded prior to the one to be broadcast, as a rehearsal, in order to be able to carry out all the changes in the mix according to the stage movements in real time.