Filter's Curve Response analyzer

[horizon7]

Some VST plugins don't have filter curve visualizer like the vintage ones.
So I want to see the curve of the filter or band in real time when tweaking it to figure out how it works. I tried standard freq analyzer like "Voxengo Span" but it isn't dedicated for this purpose.

In the tutorial below there is a plugin that shows exactly what does the EQ doing.
I can't see the company of this such plugin in the tutorial it isn't clear can someone help
or suggest a dedicated plugin for this?

[Ah_Dziz]

He's using plugin doctor. It's a program for testing plugins for frequency response, distortion, aliasing, etc.

[Niowiad]

That's Plugindoctor
https://ddmf.eu/plugindoctor/
Which I just went and checked out of curiosity and it currently costs 5X as much as the launch price.

An excellent alternative for just the EQ cuves is the Bertom analyzer
https://www.bertomaudio.com/eq-curve-analyzer.html
Which used to be $5 on Gumroad, now "pay what you want" on its own website.

Plugindoctor also has other analysis tools, most notably the dynamic analisys to check compressor's curves and attack/release shapes (very cool), and the spectral harmonic analysis (which can instead be easily done with any spectrum analyzer in your daw, and actually that's how I prefer it)

[bmanic]

Another useful tool in Plugin Doctor is the Hammerstein view. This shows harmonic distortion over the whole frequency spectrum. You can very quickly tell if a plugin is a simple waveshaper or something a bit more.

[horizon7]

That's Plugindoctor
https://ddmf.eu/plugindoctor/
Which I just went and checked out of curiosity and it currently costs 5X as much as the launch price.

An excellent alternative for just the EQ cuves is the Bertom analyzer
https://www.bertomaudio.com/eq-curve-analyzer.html
Which used to be $5 on Gumroad, now "pay what you want" on its own website.

Plugindoctor also has other analysis tools, most notably the dynamic analisys to check compressor's curves and attack/release shapes (very cool), and the spectral harmonic analysis (which can instead be easily done with any spectrum analyzer in your daw, and actually that's how I prefer it)

Yeah I thought of others thing like Dynamics & Saturation or Synth OSC quality which is great deal in here. this tool also could be helpful for learning the details that aren't visible in a plugin & also helps in Beta testing as well notifying developers for such issue.
I tested the demo & it is great but only one instant are allowed.

[horizon7]

He's using plugin doctor. It's a program for testing plugins for frequency response, distortion, aliasing, etc.

Thanks that was a great plugin.

[horizon7]

Does anyone knows how technically this plugin capture the filter's curve? I mean in a traditional analysis such analyzer requires an audible input like a sine OSC for example in order to produce the data. but here in Plugindoctor the signal coming out of a filter's plugin is silent.
I'm assuming that it will search into the plugin it self & analyze the graphical data within it for any changes zooming any artifacts or harmonics. it's like a plugin analyzer.

[Ah_Dziz]

Probably by pumping noise through it. Maybe by pingo it with an impulse.

[raintalk]

Also recommending
https://www.bertomaudio.com/eq-curve-analyzer.html