Anyway, the idea is simple - you draw the frequency responce with your mouse, and then you can get an impulse response in a WAV format.
An interface is more or less intuitive (I hope), though not very comfortable (especially choosing magnitude floor and ceiling).
Drawing - by holding the left button + moving your mouse.
If you press and hold the SHIFT button - you can move whole response up and down (in terms of magnitude).
If you press CTRL + left_click - you can add a specific point by inputing the frequency and magnitude manually. Don't forget to press ENTER in 'Magnitude' field!
Maximal and minimal (lower and higher) magnitudes are entered in separate fields. In the top-right corner you can choose a format for your impulse response (samplerate: 44k,96k,192k; length: 512, 1024, 2048, 4096, 8192 samples). I found that 44k 2048-samples worked well for my purposes.
btw you can look at how impulse looks in second tab.
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Due to some math stuff (I wanted to keep it simple) the frequency response of generated impulse might differ from desired. Especially if you have a lot of sharp peaks and pits.
In general, the app was used to create 'Minimal Phase' response, but I also added options for linear-phaze (slope phase), zero-phase, and random phase... just for fun.
Here's the file:
https://wdho.ru/90562