Audacity Forum

I have read compress.lsp and I think compress-map may be a useful piece of a compressor-expander, but I think there are some confusions in compress and agc. It looks like they introduce undocumented delays in the signal. And in compress, the conversion of gain from dB back to linear omits a factor o...

I think it is only mentioned in the library section. I am confused, is this or ain't this part of the Audacity distribution? I still can't find it in the latest svn repository. I've tried a totally different way, where the compression is locally linear but the length of the corrected segments chang...

I am tardy in updating my Audacity. I have a function called compress defined in follow.lsp which doesn't look quite like this one. I wonder whether complicated following as in Chris's combined with a more complicated gain function is worth trying. No compress function is mentioned in http://www.cs....

I am reading compress.lsp and I see it defines a gain function with three straight slopes and two soft knees that are defined by quadratics. Has anyone adapted this as a .ny? I could do it for myself but maybe someone has already done it. Igor did something strange with just a single polynomial curv...

steve wrote:Igor likes his "magic formulae".

Robert is right, what I am looking at is billed as a compressor/expander but without any smoothing at all of the envelope, wave shaper is the better name.

And he could have written it more efficiently with only 5 calls to mult instead of 12.

I found it in Nyquist 3.08 source. So nobody adapted it into a .ny for Audacity? But that should be easy enough for me to try.

Can you give me a more exact pointer? Is it undocumented? Is it in C Or Lisp?

I have read the code for both. This other is very unlike Chris's Compressor. I can't detect that it has any reputation good or bad. The fancy part of Chris's is defining the envelope just so, but then a simple gain curve is applied. The fancy part of this one is all in the gain curve -- but strangel...

Someone pointed me to this plug-in that is supposed to be a compressor, limiter, or expander depending on the settings. It is a few years old but I can't find discussion of it anywhere. I think the controls are weird, and the code is a bit weird. (And inefficiently written to implement the underexpl...

steve wrote:The more gradual the change in gain, the less noticeable it should be.

I think that's a matter of the slopes of the gain curve I plotted, whereas a soft knee means making that slope change continuously when the curve hits its bottom. Is that really important too?