Hi Emmett,

I don't have much experience with distortion algorithms, but I did use
these two tanh based distortion:

https://github.com/csound/csound/blob/develop/Opcodes/wpfilters.c#L701-L706

(discussed in Pirkle's App Note for the diode filter:
http://www.willpirkle.com/Downloads/AN-6DiodeLadderFilter.pdf)

Not sure if that's of any use.  I'd love to hear how your project turns out!

steven


On Mon, Oct 23, 2017 at 10:37 PM, Emmett Palaima  wrote:
> Hi, I was wondering if anyone could recommend some good resources on
> modeling the distortion and compression characteristics of magnetic tape. I
> am currently working on a digital emulation of the Echoplex tape delay, and
> have been using some samples I took of one of the original EP3 models. I
> have succeeded in replicating the frequency response of the tape using
> biquad filters.
>
> I am now moving on to modeling of the distortion characteristics. So far
> I've been experimenting with polynomial and tanh distortion, as well as a
> fairly basic compression algorithm.
>
> Does anyone have any addition methods / resources they could recommend?
>
> Thanks!
> Csound mailing list Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to
> https://github.com/csound/csound/issues Discussions of bugs and features can
> be posted here

Csound mailing list
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I was also reminded off-list by Kevin that there was a UDO I did a
while back of Tom Szilagyi's TAP Tubewarmth plugin:

http://www.csounds.com/udo/displayOpcode.php?opcode_id=80

The description from Szilagyi's website
(http://tap-plugins.sourceforge.net/ladspa/tubewarmth.html):

"Tube preamps and reel-to-reel tape recorders have been around for a
long time. Until the end of the seventies, the sound of almost every
great recording bears the watermarks of these intrinsically nonlinear
devices. In the eighties everything went digital, and the "harmful",
"non-perfect" nonlinearities were greatly eliminated from the
recording and mix-down process. However, it became clearly obvious
shortly afterwards, that without these nonlinear artifacts recordings
often sound dull, boring, colourless and thin, just like a piece of
plastic. As a result, efforts have been made to bring the sound of
analog equipment back to the studio -- with the power of DSP. This
plugin offers the sound of these analog devices, but without the
high-frequency roll-off of tube amps and the hiss of reel-to-reel tape
machines. With this plugin applied and properly adjusted, many types
of source materials will sound subtly richer, warmer, fatter, and
closer."


On Wed, Oct 25, 2017 at 9:33 PM, Steven Yi  wrote:
> Hi Emmett,
>
> I don't have much experience with distortion algorithms, but I did use
> these two tanh based distortion:
>
> https://github.com/csound/csound/blob/develop/Opcodes/wpfilters.c#L701-L706
>
> (discussed in Pirkle's App Note for the diode filter:
> http://www.willpirkle.com/Downloads/AN-6DiodeLadderFilter.pdf)
>
> Not sure if that's of any use.  I'd love to hear how your project turns out!
>
> steven
>
>
> On Mon, Oct 23, 2017 at 10:37 PM, Emmett Palaima  wrote:
>> Hi, I was wondering if anyone could recommend some good resources on
>> modeling the distortion and compression characteristics of magnetic tape. I
>> am currently working on a digital emulation of the Echoplex tape delay, and
>> have been using some samples I took of one of the original EP3 models. I
>> have succeeded in replicating the frequency response of the tape using
>> biquad filters.
>>
>> I am now moving on to modeling of the distortion characteristics. So far
>> I've been experimenting with polynomial and tanh distortion, as well as a
>> fairly basic compression algorithm.
>>
>> Does anyone have any addition methods / resources they could recommend?
>>
>> Thanks!
>> Csound mailing list Csound@listserv.heanet.ie
>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to
>> https://github.com/csound/csound/issues Discussions of bugs and features can
>> be posted here

Csound mailing list
Csound@listserv.heanet.ie
https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
Send bugs reports to
        https://github.com/csound/csound/issues
Discussions of bugs and features can be posted here