[audacity4blind] Re: problems using the amplify feature

  • From: Gale Andrews <gale@xxxxxxxxxxxxxxxx>
  • To: audacity4blind@xxxxxxxxxxxxx
  • Date: Sat, 30 Aug 2008 18:29:29 +0100

| From "John W. Hess" <wysiwygtechnologies@xxxxxxxxx> 
| Sat, 30 Aug 2008 08:18:22 -0400
| Subject: problems using the amplify feature
> Gale, I really goofed there. What I meant is After I select the  
> portion of the track and go to the dialog and make the appropriate  
> gain adjustment the okay button is grade out and not pressable it says  
> okay dimmed.  I don't think this is a voiceover issue.  I would think  
> if I selected info and made a change the button should not be dimmed.  

Hi John

I think I have already covered this, but perhaps not made it explicit 
enough. You cannot apply (in your example) a 3 dB gain in the 
first "Amplification (dB)" box, if the audio is already louder than 
-3 dB, because to do so would cause clipping. If you enter a value
in "Amplification (dB)" that would cause clipping, the OK button is 
greyed out, and the only way to enable it is to check the "Allow 
Clipping" box.

But really, as the "Amplification (dB)" box already shows the maximum
amount you can amplify without clipping, if you want to make the audio
as loud as possible all you need to do is accept that value and just hit 
"ENTER" as soon as the Amplify dialogue appears. That will automatically
make the track as loud as can be without clipping. 


> On Aug 29, 2008, at 9:11 PM, Gale Andrews wrote:
> >
> > | From John W.Hess <wysiwygtechnologies@xxxxxxxxx>
> > | Fri, 29 Aug 2008 16:56:48 -0400
> > | Subject: [audacity4blind] problems using the amplify feature
> >> Has anyone seen the following problem?  I want to amplify a  
> >> particular
> >> porsion of a track and select it and then go to the effects menu and
> >> amplify dialog. I see that there are two fields. ONe to set the gain
> >> and one to set the max gain I guess.  When I change the gain say from
> >> 0 to plus 3 and try to click okay it's muted. I am using a mac with
> >> voiceover.  This is the only effect I have had this happen with. I
> >> know the track is selected because if I try to apply something else  
> >> it
> >> works fine. Any one else seeing this? Thanks.
> >
> > We can't support Voiceover properly as the GUI toolkit we use  
> > (wxWidgets)
> > does not do so. So, the Amplify labels may not be read out.
> >
> > The first box is "Amplification (dB)". It shows the maximum amount you
> > can amplify by without clipping. The next text field is "New Peak  
> > Amplitude
> > (dB)". The two fields are interdependent. You cannot enter a value  
> > in either
> > field that will cause clipping (that is, that will cause the "New  
> > Peak Amplitude"
> > value to exceed 0.0), unless you put a check mark in the field called
> > "Allow Clipping". This field comes straight after "New Peak  
> > Amplitude".
> >
> > To put a check mark in "Allow Clipping",  tab to it, then press  
> > spacebar.

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