OtsAV can display the waveform of the songs loaded in each deck. This feature can be used to assist with beat syncing and mixing, and to see the general audio layout of the song.
The following options can be found under View -> Waveform View
Enabled: Enables/disables the Waveform display.
Height: Select from Short, Medium, Tall and Very Tall.
Mode: Select from Overlay or Symmetrical.
Overlay Waveform View
Symmetrical Waveform View
Track Direction Control: When songs are played in reverse, the waveform still runs right to left, but the waveform for that song is also reversed. This can be used to play beats backwards, and still keep them in sync visually.