[ardour-users] TAP Dynamics question - not directly ardour related
jkarnes1 at austin.rr.com
Sat Jun 19 21:12:04 PDT 2004
Tom Szilagyi wrote:
> On Fri, Jun 18, 2004 at 10:26:06AM -0500, Josh Karnes wrote:
>>Working on developing some new functions for TAP Dynamics to do optical
>>compression emulation, [...]
> That would be really great :)
OK well I have made some real progress on this, and I have about 72 experimental
functions defined now, so the next move is to audition all of them and figure
out which sound good and why.
In addition I may try some stuff with two-stage envelopes.... For starters I'll
just put two instances of TAP Dynamics in a row with staggered envelope settings.
> Have a lot of fun with it. :)
> And if you have any usable functions, please send them so my plugin
> may as well evolve.
Well, since the compression ratio is not adjustable, it is unlikely I'll have a
small number of useful functions... you know for each compression ratio, I have
to have a different function def.
The way I am developing these curves is using a spreadsheet and 13-20 data
points for each one to make a complex curve (sort of "S" shaped), using math
functions to calc the knee and what I call "reverse knee". The math is simple,
but changing the compression ratio changes all of the numbers since the "knees"
are calculated based on the ratio.
There is also a variable "width"... idea is that an optical compressor can only
compress a particular midrange of dynamics. If the threshold is -6dB for
example, then it can compress from -6dB up to maybe +3dB within the defined
ratio (roughly) but above that it no longer compresses. So you end up with a
curve that looks like this:
* * * *
The number of dB between the threshold and the "reverse knee" I am calling
Eventually a plugin to do this would have adjustable "width", "threshold", and I
like your input and make-up gain ideas, as well as adjustable compression ratio,
and I still have to audition to find out the best-sounding "knee" curves.
I'll keep you posted.
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