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Subject:Boundary Problems with Graphic Fade
Posted by: tjc
Date:11/23/1999 10:11:00 PM

I have been meaning to post this for a while, but Sonic's
old web page was such a dog I could never register... don't
know if this has been addressed already.

Here is how I solved the problem of getting a click when you
change the volume in different areas of the same file in
Soundforge XP 4.5 without any of the quality loss associated with
using the smoothing feature.

I had a bootleg DAT with low volume on the songs and high
volume on the applause. If I increased volume over whole
file, I would get major distortion through the applause
region.

Here is a decent solution:

1. Use the "Selection" feature under Edit menu to select
the region you want increased. Note the precise beginning
and endpoint.

2. Increase volume, in my example 400%.

3. Select the last second or two of the region with the
increased volume. It is essential that the end point of the
region to be faded have the same endpoint as the region to
which the increased volume was applied, down to the
thousandth (.775).

4. Select graphic fade. The beginning of your fade is
100%. The end will be determined by the amount you
increased the volume: for a 400% increase, the end of the
graphic fade will be at 25%. You do not need to add any
handles, just grab the endpoint and slide it down. The
percentage must be matched as closely as possible.

5. Then select the first second or two of the region to
which the increased volume was applied. In this case you
must have precisely the same beginning point. Since this is
the beginning of the increased volume, the graphic fade
starts at 25% and ends at 100%.

If you select your the beginning and endpoints carefully
(e.g. when there is relative silence, no unique noise like a
single person yelling wooo!, etc.) the fades are barely
noticeable.

There is no clicky noise either. Again, the key is having
the beginning/endpoints of your fade at precisely the same
point and getting your percentages correct.

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