You will start by adding a number of audio files to your scene. Next, you’ll display the files as clips on the Dope Sheet track editor and adjust their sequencing to fine-tune the audio playback.

Set up the lesson:

• On the Quick Access toolbar, click (Open File), navigate to the animation\prosound folder, and open prosound_start.max.
  NoteIf a dialog asks whether you want to use the scene’s Gamma And LUT settings, accept the scene Gamma settings, and click OK. If a dialog asks whether to use the scene’s units, accept the scene units, and click OK.

Add sound files to your scene:

1. On the main toolbar, click (Curve Editor (Open)).
2. In the Curve Editor controller window, click the Sound track to highlight it.
   
3. Right-click and from the quad menu, choose Properties.
4. In the ProSound dialog Input Files group, click Add.
   

   The Open dialog automatically opens to the \sounds folder in your active project folder. If the sound files flyby.wav, inflight.wav, start_engine.wav, and takeoff.wav are not there, navigate to the folder where you saved your ProSound tutorial scene files.

5. Highlight the flyby.wav, inflight.wav, start_engine.wav, and takeoff.wav sound files, in any order, then click Open.

   The files display as a list in the Input Files group. While it is not mandatory, it can be helpful to place the files in the order in which their sounds are heard in the sound track.

6. From the Input Files group sound files list, highlight start_engine.wav and click Move Up as many times as needed to place the file at the top of the list.
   
7. Highlight takeoff.wav and click Move Up until it displays just below start_engine.wav. Use Move Up to place the flyby.wav next in the list.
8. Highlight a file in the list and in the File Details group, click the Play button to hear how it sounds.
   

   The File Details group also contains options that let you control how the file plays back in the scene. You can, for example, loop the file so it repeats a specified number of times, or enter the first and last frame on which the sound is played. The Active option lets you include or exclude the sound file in the playback.

   In this tutorial, however, you will set these and other file playback parameters in a more visual way by using the Dope Sheet.

9. Close the ProSound dialog.

View the sound tracks in the Curve Editor and Dope Sheet:

1. On the Curve Editor track view hierarchy, expand the Sound track to display the master track as well as four additional tracks, each of which represent the sound files you loaded into the scene.
   
2. Expand each track. Each time you do so, highlight the track’s Waveform component to display it.
   

   A waveform is an image that represents an audio signal, showing a change in amplitude over time. Soft sounds, like footsteps, produce a narrow pattern, whereas sharp sounds, like the scrape of a chair leg, show a wider pattern. Waveforms help you visualize the events in an audio recording.

   Notice how only one track waveform is visible at a time in the Curve Editor. (The master track waveform provides a visual compilation of all tracks.)

   In this tutorial, it would be helpful to view all the waveforms together, so you can better adjust the timing of their audio segments. You can view multiple waveforms from the Dope Sheet.

3. On the Curve Editor menu, choose Modes Dope Sheet.
   
4. Collapse the master track to view just the waveforms and volume components of the four individual sound tracks.
   

   The first, second, and fourth sound tracks were recorded in mono and show a single waveform. The third sound track, flyby.wav, was recorded in stereo and displays two waveforms, one for its left and another for its right channel.

5. Play the animation to hear the sound files.
   

   The segments overlap and produce a jumbled sound. You need to adjust the timing so each plays back at a more logical place in the animation.

   Stop the playback.

Synchronize the audio with the animation:

1. On the Dope Sheet toolbar, click (Edit Ranges).
2. Click the start_engine.wav range bar and move it left and right to see how you can reposition the audio segment anywhere on the timeline.
   

   You need to reposition the start_engine segment to coincide with the part in the scene animation where the biplane propeller starts to turn.

3. Move the Dope Sheet window until the Camera01 viewport is visible.
4. Drag the time slider until you see the propeller start to pick up speed, which is around frame 50.
   
5. Click the start_engine.wav range bar and drag it until the segment waveform is positioned at the vertical blue lines, which indicate the current frame.
   
6. For now, concentrate on just the start_engine.wav track by selecting the other track range bars in the Dope Sheet and moving them to the right, past frame 200.
   
   TipAlternatively, you could temporarily mute the sound tracks in Track View by selecting their file names in the ProSound dialog and turning off the Active check box, as described in the previous procedure.
   Scrub the animation.

   The plane starts to move down the runway at frame 160. This is where you want to place the start of the takeoff.wav audio segment.

7. Click the takeoff.wav range bar and drag it until the segment waveform starts at frame 160.
   

   As the plane begins to taxi down the runway it would be a good idea to prolong the start_engine audio segment, to simulate a sputtering takeoff.

   You could prolong the segment by going back to the ProSound dialog and in the File Details group, set Loops to repeat the segment as many times as needed. The next step shows you a different method.

8. On the Dope Sheet, click the right end point of the start_engine.wav range bar and drag to the right.
   

   As you drag, the audio segment is repeated. You can drag for as many repetitions, or loops, as you like.

   The end of each repetition is indicated by a vertical bar, as shown in the next illustration.

   
9. Continue dragging until the segment is repeated just once.
   
10. Move the Dope Sheet window until the Camera04 viewport is visible.
11. Scrub the animation again until, at around frame 405, you see the wheels of the biplane lift off from the ground.
12. On the Dope Sheet editor, drag the flyby.wav range bar until the segment waveforms start at frame 405.
    
13. Scrub the animation again.

    The waveform should peak at or around frame 435, when the biplane passes directly overhead.

14. On the Dope Sheet, reposition the inflight.wav range bar so that the waveform fades out at the end of the animation, as shown in the next illustration.
    
15. Replay the animation to hear how all the audio segments fit together.

Try scrubbing sounds in reverse:

By default, the audio plays forward as you play the animation forward: There is no audio when you scrub animation in reverse.

1. To hear the audio in reverse when scrubbing, highlight, then right-click the Sound track in the Curve Editor or Dope Sheet and from the quad menu choose Properties. In the ProSound dialog Playback group, turn on Permit Backwards Scrubbing.
   
2. Try scrubbing the animation back and forth.

   Now you can hear all audio in the scene play in reverse.

Save your work:

• Save the scene as my_biplane_sound.max.

  You can compare your work with a finished version of the scene by opening prosound_completed.max.