Original subtitles

- [Instructor] RX 6 keeps a record of all the edits

you make in a file, allowing you to return

to previous states of your audio

before you made certain changes.

This give you the freedom to experiment and play around

with various tools and modules without having to worry

about damaging your file in any kind of permanent way.

So just as a quick example here, I'll walk

through a basic audio repair workflow.

I've opened up a clip from a song where I'm having an issue

with an acoustic guitar string squeaking

as the guitarist slides his finger along the string.

Let's listen and see if you notice it.

(melancholic music)

(guitar squeak)

So it was right there, see if you can hear it again.

(melancholic music with guitar squeak)

One more time.

(melancholic music with guitar squeak)

So, once you notice it, it's pretty distracting,

and I definitely want to reduce it in this case.

Now, because it's a particular sound, and not a section

of time I want to get rid of, I'm going to drag the slider

over here so that we're looking just

at the spectrogram display.

If I place my cursor here and play it again,

you can probably see this bright portion

right here in the recording that represents that squeak.

(melancholic music with guitar squeak)

I'm going to use the scroll wheel on my mouse

to zoom in to that area, and we'll do the same thing

vertically by moving my mouse over here

and scrolling as well.

That might be right about there.

Alright, so here's the squeak.

Now because it's an irregular shape,

I'm going to grab my brush tool and holding down on it,

I think we can change the size,

it doesn't have to be quite that large.

Maybe around 15 should do it.

Now I'm just going to brush over that area in the spectrogram.

And because this is a stereo file, we can see it highlighted

in both the left and right channels.

If there's a sound that's only present on one channel,

you can click the left or right strips over here

to only make that selection on that channel.

You can double click to select both channels again.

So, there are a few things we could do here,

but probably one of the easiest ways to eliminate the sound

is to come over to the Spectral Repair module.

Now, we'll look more at this later, but here

I'm going to make sure we're in the Attenuate tab,

and I'm going to set the strength to...let's try 2.5.

Now, setting the strength too high might remove some

of the other frequencies that we want to keep,

but setting it too low will leave too much

of the squeak in the file.

Now I can click Compare, and this lets me hear

the selection both in it's original state,

and with the current settings applied.

(guitar squeak)

So I can definitely hear that squeak.

Let's try with the settings applied.

(softer guitar squeak)

Now that's okay, but I think I want to reduce even more.

Let's try three. We'll add that comparison setting.

(faint guitar squeak)

And I can still hear a trace of it,

but it's definitely not as present as before.

So I'm going to click Process, and if I close this

and deselect with Command or cntrl + d,

you can see that bright area has kind of disappeared now.

And let's listen.

(melancholy guitar music)

So I think that's much better.

Again, I can still hear a trace of it,

but it's not nearly as present as it was before.

Now, if you look down here in the lower right hand corner,

this is where you'll find the History panel.

And you can see a listing for the one change

I've made so far, Spectral Repair Settings.

And above that we have Initial State.

So as I continue to work on this file, for example,

if I click the EQ module, and I just make

a quick change here and process that,

you can see that EQ now appears in the History pane.

If at any time I want to go back to any previous step,

all I have to do is click it, and those steps are undone.

I can still see EQ listed here, but it's grayed out

to indicate that it's not currently applied.

Now, I can even go back to the initial state

to return the file back to how it was

when I first opened it, if I want to start

from scratch again.

You can see that brings back the guitar squeak

and the selection around it.

So again, this lets you freely play around and experiment

with different modules, and you never have to worry

about ruining your file.

The history is even saved between sessions,

as long as you save the project as an RX document.

So if I choose File, Save RX Document As,

and I save this on my desktop,

and if I just hide iZotope for a moment,

here's the file I just saved, and you can see it saved

with the extension of rxdoc.

So, now even if I quit RX 6, when I double click

that project file,

it opens exactly where I left off,

including the selection that I had made at the time,

and the changes I made are still in the History panel,

even though they're not applied at the moment.

But I can still select them to reapply them.

So be sure to save your files as RX documents

if you want to be able to keep your work.

RX documents are entirely self contained,

meaning they contain the audio file and all the data

about your edits, so it's easy to move your work

to another computer simply by copying the single file.

You don't have to worry about other attachments or files

to move along with it.