Hello,
I've recently purchased a DDJ-RB controlled. I've installed rekordbox dj, installed latest v1.001 driver and updated the controller's firmware to v1.02. I'm using Windows 8.1, default sound output device is set to speakers, not DDJ-RB line.
If I have the audio device set to DDJ-RB ASIO in rekordbox (which is the right setting I presume) I have the sound coming out from the speakers of my laptop and sound from headphones connected to the controller, but the Master Level knob on the controller doesn't have any effect on the volume coming out from the speakers, as if it was always all the way up, and the visual master level knob in the rekordbox (in the upper right corner of the screen in the performance mode) is dimmed. I can adjust the master volume using the levels in the Windows mixer on my laptop though, but it's highly inconvenient as I have to use mouse and keyboard instead of the controller.
If I switch the audio device in rekordbox to Speakers - I can hear music from the speakers, the Master Level knob affect the master volume coming from the laptop's speakers, the visual master level knob in the rekordbox is showing the level set by the knob on the controller, but I have no sound coming from the headphones connected to the controller whatever I do, e.g. switching on all the cue buttons and setting headphones level to the max.
Every other button or knob is working fine.