Look to make sure the HD24 audio recorder is turned off. Connect the AC adapter to the back of the audio recorder then plug into a power source.
Plug audio cables into the "Outputs" of the mixer. Plug audio cables from mixer "Outputs" into the "Inputs" on the back of the HD24 audio recorder.
Connect "Outputs" of the HD24 audio recorder into the "Line In" or "Tape In" slots on the mixer with audio cables. Turn on the HD24 audio recorder and ensure that the unit doesn't say "Connect Error" across the front. Reconnect the audio cables if the "Connect Error" message is displayed across the screen.
Turn on the mixer and determine if it detects the HD24 audio recorder by looking for a green "Input" light located at the top of the mixing board. Reconnect audio cables if the mixer doesn't detect the HD24 input.