There are a few ways you can hear audio during a timeline playback:
The audio signal is captured and played back from the DVS or AJA breakout box (BOB). For information on connecting the external audio devices, refer to your hardware guide. When you are capturing, playing back, or playing out audio tracks, you can select up to 16 tracks (eight tracks of DVS/AJA AES audio, or 16 tracks of embedded AJA audio) from the track selector at a sampling rate of 48 kHz (16-bit or 24-bit). See Capture Menu Options or Playout Menu Options.