Comments on: Audacity: The Free Dimensional Sound Editor, Part Two

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By: ggmathew

ggmathew — Thu, 31 Mar 2011 02:30:07 +0000

I use Audacity frequently and I haven’t noticed the click.

By: Anthony Chilco

Anthony Chilco — Thu, 17 Mar 2011 13:41:17 +0000

Oops.
I’ve never heard a click, but that’s because I’ve never done what you’ve suggested. I’m not speaking from experience, but from the point of view of the physics. Introducing a step function in the volume level in effect produces a square wave, whose magnitude is equal to the difference in volume. The laws of physics dictate that you will produce a sound that wasn’t in the original program. It may be masked by the voice over, but it’s there just the same. Zoom in on the music at the start or end point of the volume shift and you’ll see a vertical line.

By: Ken Hess

Ken Hess — Sun, 13 Mar 2011 04:17:19 +0000

I’ve never heard a click. This method creates a smooth sound. If yours is making a click, I’d check the hardware.

By: Anthony Chilco

Anthony Chilco — Thu, 10 Mar 2011 17:29:38 +0000

Re- lowering the volume in the voice over section of the music.

The procedure you’ve outlined will produce a step function in the music track where the volume drops and goes back up again. This will be audible as a click, the severity of which will be directly related to the difference in level. A smoother method is to select the section of music and duplicate it (ctrl-d). Select the duplicate section and invert it. Fade the beginning in and the end out. Reduce the level of the duplicate to produce the amount of volume reduction that you want. Since the duplicate track is inverted, it sums with the original to lower the volume. One advantage of this method is that it doesn’t modify the original track so the file can be saved and the changes undone at a later date. I combine the two tracks before outputting a wav file, but don’t save that change.