in normal mode only out one chanel and no mapping
we are sorry to tell you but at the moment WASAPI, Windows Audio Session API, is not supporting more than two channels with external devices. We are in contact with Pioneer to fix this issue to make a 4 decks of the DDJ-SZ fully accessible.
In the meantime, the DDJ SZ can still be used as midi controller, I know this is frustrating but we are doing our best to provide the support as fast as possible.
When you say two channels you mean L + R or two desk?
I have several cards with multiple outputs and Asio, it is impossible to configure the outputs for precuing