The audio input player is a special player which plays audio from an input source like a microphone. It is not connected to the fader, it can nontheless be used with room placement. For technical reasons (mixing, effects, time synchronization) there may be a short delay between audio input and output. The audio input player is located in the lower part of the main window:
To activate it, choose an audio input device in the pop-up menu. It should contain a list of the audio input devices and sources connected to your computer. You currently need to relaunch DynamDJ whenever new devices have been connected while it is open. The lower part of the audio input player consists of four audio parameter sliders, which work the same way as those of the audio file players.