Put a Colored Noise Generator first, set it to white noise, put your plugin next, then SPAN with a flat slope. Low Boost and Low Attenuation cancel each other out. There is no shelf effect, no "dip".
There is a thread from a while back where a few of us gave it a shot.
https://forum.cockos.com/showthread.php?t=126728
A simple shelf is obtained by adding a lowpassed signal to the dry signal. In other words,
Shelf(x) = x + LP(x)
A simple way to get the Pultech effect on the low end is to
Pultec(x) = x + LP(x) - LP2(x)
Where LP2 is an identical lowpass but at a higher frequency. I used one octave up. You can vary the intensity of the shelf and dip by using a simple blend knob, ie
Pultech(x) = dry*x + wet*( LP(x) - LP2(x) )
...
Obviously you should do your own experimentation to come up with your version of it, but I can tell you that you can get a pretty healthy effect out of just using single order filters, bumping up to biquads can make a very exaggerated effect, one I decided that I didn't like.
If I was to try again I would use a different saturation function, add oversampling, maybe a DC block, and tweak the knob values for sure. Also I only modeled the effect on the low end, I didn't take it any further than that.
JSFX PulEQ-emu
Linear Mode
