Comentario oficial
PC Master Out is only available with certain devices, the V10 is not one of them, sorry. In order to replicate that you could create a multiple-output device in your Mac's Audio Devices panel by adding the internal speakers and the V10 (effectively what rekordbox does anyhow)


Is this option only available with the DDJ series or is one of my settings wrong. I'm attaching screenshots of my Rekordbox and MIDI audio settings. all my software is up to date with the latest drivers.