# [audacity4blind] Re: text envelope question

• From: "Dang Manh Cuong" <dangmanhcuong@xxxxxxxxx>
• To: <audacity4blind@xxxxxxxxxxxxx>
• Date: Wed, 29 Aug 2012 09:36:12 +0700

```OK. I'll play with it, and send my featback question if I still not understand.
----- Original Message -----
From: Steve the Fiddle
To: audacity4blind@xxxxxxxxxxxxx
Sent: Monday, August 27, 2012 9:20 PM
Subject: [audacity4blind] Re: text envelope question

The basic concept of a control point in the Text Envelope is that it
defines the amount of amplification at a given point in time.
This concept is the same as how control points work with the
(inaccessible) Envelope Tool.

An example:
If you have a track that is 5 seconds duration, then amplifying the
entire track by -6 dB (minus six dB) would result in reducing the
Let's say that rather than reducing the volume of the entire 5 seconds
to half volume, you wanted to start the 5 second track at full volume
and for the volume to gradually decrease so that at the end of the 5
second track it was at half volume.
This can be accomplished by setting a control point at the beginning
of the track (time = 0) with the amplification amount set at 0 dB (no
change) and a second control point at the end of the track (time = 5
seconds) with the amplification set to -6 dB (half volume).

As the most commonly used control points are the start and end of the
selection, there are special text input boxes for these control
points.

"Initial Amplification" sets the control point at the start of the selection.
"Final Amplification" sets the control point at the end of the selection.
For these two control points it is only necessary to set the
amplification amount as the time element is defined by the selection.
If these boxes are left blank they default to 0 dB (no change).

The final text input box is for "Intermediate Control Points". That
is, control points that lie within the selection. Control points are
added here bay entering a pair of values. The first of the pair is the
time and the second is the amplification amount.

Does that help?

Steve

On 26 August 2012 10:38, Dang Manh Cuong <dangmanhcuong@xxxxxxxxx> wrote:
> Hi all
> Just a confusion about text envelope plugins.
> I think I don't understand the control poinnt clearly. So I'm happy to
> recieve all of your responsibility that explain it.
> Cuong Dang Manh
> ________________
> Dang Manh Cuong
> HCMC University of Pedagogy:
> The Psychology and education
> Mobile: +84 902-572-300
> E-mail: dangmanhcuong@xxxxxxxxx
> Yahoo! ID: manhcuong0312
> Skype name: dangmanhcuong
> Blog: http://vi.netlog.com/Cuong_littlecat
> Website: http://ngoisaodanduong.com
> http://www.saomaicenter.org

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________________
Dang Manh Cuong
HCMC University of Pedagogy:
The Psychology and education
Mobile: +84 902-572-300
E-mail: dangmanhcuong@xxxxxxxxx
Yahoo! ID: manhcuong0312
Skype name: dangmanhcuong