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There will definitely be times when you won't want your audio clips to begin and end abruptly, but instead gradually fade in and out. In either ones of the Waveform Editor, you'll see these two boxes. I've got one right here and one right here. These are the Fade Controls, and they're very simple to use. Now, for this example I've opened the file called interview_BD.wav, and this is a clip from an outdoor interview. Let's listen to the first few seconds. (male speaker: Well, we have one farm in Ojai, where we've been since--) Now you should have heard that the sound stopped pretty abruptly there.
Because this was recorded outdoors, we're hearing a lot of ambient background noises at the beginning, and it's kind of a harsh way to begin the clip. So what I'll do is click this Fade In icon and drag it to the right. Notice this drags out a line. This indicates the speed of the fade. By dragging more or less horizontally to the right, I'm creating a very even fade in. So the clip will start from silence and then fade up into full volume. And you want to place the top end of the yellow line right at the point where you want the clip to be at full volume, basically right where the dialog starts there. Now let's listen.
(male speaker: Well, we have one farm in--) So right away that's sounding a little better to my ears. You can still hear that background noise, but now it fades in so it's not as jarring. I'm just going to undo that. Now, you can actually adjust the timing of the fade by dragging your mouse up or down while dragging to the right. I'm going to zoom in a bit on the waveform here. So I'm going to drag the fader to the right but also slightly down. Notice the curve that's put in the fader line. You can also see what it's doing to the waveform itself. As I drag to the right, you can see it's affecting that waveform in real time there.
But by dragging it down this way, I'm going to have a longer period of silence at the beginning and then the volume is going to swoop up to full volume right before the interviewee starts talking. So again, I'm going to place the end of this right before he starts talking. And let's see what that sounds like. (male speaker: Well, we have one farm--) And that sounds much better to me. Now you can also go the other way. I'm going to do that fade in. If you want a really fast fade in, you can drag up as you drag to the right.
That puts the opposite type of curve in there. So that barely gives you a fade at all. And it might be appropriate for some scenarios where you don't have a lot of dead space to play with at the beginning of your clip. But for this example, I like it the other way. So I'm going to drag that back down, and that might fade back in like that. And you can do the same thing at the end of the clip. Let's listen first. (male speaker: --in very close proximity to the rest of our life, and that our other--) Okay, so here at the end, we have a bit of what he was continuing to say, but I want this clip to end right before that, basically, right where this waveform is.
But if I drag the Fade Out box straight across to that point, you can still kind of hear, and you can even see that I'm still going to hear what's going on at the end there. (male speaker: --the rest of our life, and that our other--) So it kind of fades out, which might be an effect that we want to go for, but in this case, I want it out of there completely. So I'm going to undo by hitting Command +Z, or on PC Ctrl+Z. Now, yes, I could just select this and delete it, but just for this example, I'm going to drag my Fade box over to the left and down.
And I'm just keeping an eye on that waveform as I shrink it. I basically want it gone. And there's my fade. (male speaker: --to the rest of our life.) So we don't hear any of that original audio anymore. Now if you find yourself doing these sorts of curved fades more frequently than you do a straight linear fade, you can go to Audition > Preferences, or Edit > Preferences on Windows, and under the General section, here you can choose Cosine, or S-curve, under the Default Fade Curve Type.
So as you can see, when I drag in-- let's go to the beginning here--you can see the curve has more of this S-shape to it even though I'm just dragging horizontally. So that just gives me, again, a little bit more silence at the beginning, and then it swoops up to full volume. Now you can still drag up and down to increase or decrease the fade speed, you just might not have to do it as much vertically with the S-curve as your default. Okay, and that's how to fade clips in and out.
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