effect(filter) for amplifying by separate wave sequences.

Hello friends.

I have been using Dominic Mazzoni’s amplify effect included in Audacity 1.3.5 , and it works perfectly … for what it does, it judges which of the waves ampiltude is greatest, therefore choosing it as a base for the maximum amplitude without clipping(I am deducing).

So I have a whole voice track I want to amplify. I used amplify effect and it augmented x db . But then I wanted more amplitude. Of course the maximum amplitude wave in the whole track is already toped before clipping, so running again the effect on the whole track selected would make no change(unless it clipped, which I decided not to, since the beginning). So I strarted selecting the separated voice sequences manually, and applying for each isle, the amplify effect.

My question would be, is there an already existing effect that automatizes this or would I have to write my own script?

I don’t know of any plug-ins that do exactly what you are asking, but you may be able to achieve a similar effect with “Chris’s dynamic compressor” http://pdf23ds.net/software/dynamic-compressor/

Thanks, it actually helped a lot!

This plug-in has helped me so much in Audacity to normalize the whole narration. Especially with the newest version. Highly recommended if your recordings are not loud enough.

Audacity to normalize the whole narration.

Messy choice of words, because “Normalize” is an Audacity tool with very roughly similar properties. Chris is a dynamic loudness processor, similar to the ones at radio stations. The elves once generated Chris’s settings to almost exactly simulate the processing at KPCC radio in Los Angeles.

Chris’s Processor is “musical” in that he designed it to sound graceful and pleasant. Most tools are arithmetic exercises.


I am sorry to hear Chris’s death.

Chris’s website is not working anymore. Does anyone have any backup of his software (binary and source code)?


Very sorry to hear that.

I was going to post a copy of Chris’s Compressor here, but then I remembered his terms forbid redistribution …

;;Authored by Chris Capel (> http://pdf23ds.net> )
;;All rights reserved
;;Permission granted for personal use, without redistribution.

Chris’s website (in 2008) has been archived …



Thank you for the snapshot. However, to be used in batch processing (many files), using standalone executable would be easier, right? (Or maybe I can write Nyquist to batch processing?)


I never used the standalone verson, only the Audacity plug-in versions, so I can’t help you there.

Audacity does not currently support batch processing with Nyquist. However, Audacity has a built in compressor (in the Effect menu) that can be used in “Chains” to perform batch processing.
See these links for more info:

Thanks, Trebor. I used those very old links to update the Wiki Compressor page.

I see at least one person is distributing Chris’s later 1.2.6 version (which still says “all rights reserved” and “Permission granted for personal use, without redistribution”). The link to it is on:

and that page is linked to on the WIki Tutorials page.

I never knew Chris well. Do we have any concerns about the hosting?


Do we have any concerns about the hosting?

What concerns might there be? I think the restriction is an abbreviation:

;;Authored by Chris Capel (http://pdf23ds.net)
;;All rights reserved by the author
;;Permission granted by the author for personal use, without redistribution.

Since the author no longer exists…

I have his whole web site archived – for personal use, of course.


The internet archive’s Wayback machine has got them in trouble for redistributing material without the authors permission …

Legal status
In Europe the Wayback Machine could be interpreted to violate copyright laws. Only the content creator can decide where his content is published or duplicated …


Copyright persists after death …

In most of the world, the default length of copyright is the life of the author plus either 50 or 70 years. In the United States, > the term for most existing works is for a term ending 70 years after the death of the author> .