Learn how to use Strip Silence, including setting the threshold for how quiet audio must be before it is automatically silenced using Edge Fade, and set the minimum duration of silence between audio clips for easier editing of long projects.
- [Instructor] Often when recording interviews, out and about, background noise is an issue, and Strip Silence can be a great way to get rid of that unwanted noise. So let's see how to do this. I'm going to scroll down, and look at my library, and this thing called New Recording was a vocal recording that I made earlier in the course, so I'm going to tap where it says New Recording, and tap the Edit button, and it tells me that I have already used this in another project.
That's OK, I will create a new project, and here it is. And this is actually my voice through the iPhone built-in mike, and I'm going to play just a little of this. Now I am recording. (recorded voice plays briefly) Indeed, you can hear the room noise, the hiss, coming through the microphone. And that's OK, but it might sound a little more professional if we could get rid of that.
So, I'm going to tap the audio clip, and it's selected, and I'll tap it one more time, and at the right-hand side I see Strip Silence, I will choose that. And now you can see automatically everywhere where I wasn't speaking, there are sort of blue diagonal stripes. And I have three controls at the bottom, Threshold, Fade Edges and Minimum Silence. So, the threshold is, how quiet does it have to be before it's removed? So it seems like that already automatically is selected really well.
If I turn up the threshold by dragging to the right, you see that it is silencing louder and louder things, which is not really what I want. And if I go too far to the left, now nothing is selected for removal. So I think I have nudged it back up to the appropriate place. And you can see as I continue to press the Threshold control, that above where it says Threshold, it displays the exact level in decibels that it's set for.
And I accidentally nudged it so I'll turn it back down again. That looks about right. And, Fade Edges to the right, if this is all the way down, then when the audio is deleted, I will have very sharp edges that I might hear. But if I turn that up a little bit, you can see above Fade Edges it's showing me in milliseconds how much it's going to be smoothed.
I'll leave it there. And then on the right-hand side, I have Minimum Silence, so this is the minimum amount of silence that is necessary in order for stuff to be removed. So if I turn this up, now nothing's going to be removed. So if I turn it back down, now all of those quiet things can be removed. So why would you want to turn up the minimum silence amount? Well, if you have a really long interview, for instance, with a long break, maybe someone went to go get a glass of water or something, you might want to make sure you lose the long breaks, but you might not want to have a ten-minute or 30-minute or 60-minute file suddenly cut into many, many little pieces.
So that's where it might come in handy to turn up the minimum amount of silence necessary in order for deletion to occur. So, speaking of deletion, I'll show you what I mean by that, I will click Done, because this looks good to me. And now you can see those almost-silent, room noise-filled bits have been completely removed. And now I have separate clips, so if I tap outside to the right of these clips, you can see they're all separate, and if I click on the one just before the 20-second mark, you can see that's now a separate clip.
And I'm going to tap and press Play. Now I am recording (recorded voice plays) and I will press the Bookmarks button at the bottom here. (recorded voice ends) So now there's perfect silence in between those speaking moments. Now if I want to tighten those up, if my pauses are too long between thought, I can do that as well. I want to select all of these clips, and I'm going to click my Track Tools button here, and scroll down and Select All on Track.
OK, now all of these clips are selected again, and I can tap on one of them, and now, since I have paid for the in-app upgrades, I have this Tighten option on the far right, which I'm going to choose now. And as you can see, it immediately scrunched all of those clips together, and removed the silent parts. Now, the amount is turned all the way up, that might sound a little unnatural if we listen to it. Add a second bookmark (recorded voice plays) and now I'll press pause in the middle, and now I'm recording again, and I'll press pau-- (recorded voice ends) OK, so, it sounds like I'm not breathing, perhaps, and if I wanted to add a little more space, I can turn down this amount, so I'll touch under where it says Amount, and then slide my finger to the left and you can see the gaps get a little bit wider.
And again, I have a Minimum Silence control that I can turn up, so this way, by turning up the minimum silence, it's making sure that there is at least a certain amount of silence between the clips. Alright, so as you can see, you can use Strip Silence to get rid of troublesome environmental noise and you can use Tighten to tighten up your interviews and voiceovers.
- Recording audio
- Setting bookmarks
- Navigating the library
- Importing audio
- Navigating the editing screen
- Creating fades and crossfades
- Editing with Ripple Delete and Ripple Insert
- Using Strip Silence in your project
- Using the History tool
- Mixing and exporting
- Using the track controls and ducking
- Adding effects
- Setting the audio format for exporting
- Sharing and archiving your projects