Does this unit have a fader start function?

Yes, it does. When this unit and a computer on which Serato DJ is running are connected with a USB cable, such operations as starting the playback of tracks in Serato DJ can be controlled using this unit's fader. Connect this unit to a computer on which Serato DJ is running beforehand. This unit does not support a connection with CDJ using the PRO DJ LINK function or by connecting a control cord.