INPUTS & RECORDING
The Denon DJ Prime 2 offers 2 Microphone inputs (connections at the rear panel) and various controls at the top-left panel for both of them. Both Microphone inputs are not part of the USB Audio Interface, and cannot be included in VirtualDJ Audio setup. None of the Mic controls of the device will control mic-related VDJ actions or GUI buttons and vice-versa.
Even though all Mic controls of Prime 2 send Midi messages and could be assigned to any VDJ script action, it is strongly advised not to do so, as the hardware operation will still apply.
The Denon DJ Prime 2 offers a dedicated Record input and this is part of the default Audio setup. As long as the setup is as per the following image (includes the Record line to Chans 1,2), your mix will be recorded including the signal from the Microphone and AUX inputs.
If for some reason you don't want the Inputs to be recorded, or the recorded signal is low, you can remove this line and your mix will still be recorded.
The Prime 2 offers an AUX Input (connection at the rear panel) and a AUX LEVEL knob at the top panel to control its level. This input is not part of the USB Audio Interface, so cannot be used in VirtualDJ Audio setup as Line Input or DVS (timecode) input. The signal of this Input will be directly routed to the Master/Booth output.
The signal of this input will be available (and heard to Master output) regardless the mode (Standalone or Engine) the Prime 2 will be.
The Denon Prime 2 can operate either in Computer mode (using VirtualDJ or other supported DJ application), or in Standalone mode using the integrated Engine. However there is no back-to-back operation or an easy changeover between the 2 modes, as you will need to "close" one system first, before you "open" the other one.
A smooth transition between the 2 modes can be achieved though. While in Computer mode, you have the ability to connect an auxiliary audio/media source to the AUX Inputs and control its volume with the AUX Level knob at the top panel Then while this source is playing, you can switch from one mode to the other without notice.