Ro_naut

I'm trying to learn the equation to set the cutoff frequency in a vst~ loaded with fabfilter pro q 2.

I need to send the vst~ a number between 0. - 1. That then correlates to hertz inside the vst~.

How can I specify the cutoff frequency in Hertz first, and then convert it to its number between 0. 1. ?

What is the equation to scale hertz to 0. - 1.

setting-cutoff-frequency-in-hertz-using-vst-fabfilter-pro-q-2

Are you using the VST or AU version? I know - its hard to determine that these days when vst~ hosts either… but often AUs have their parameters normalized to 0.–1. and VSTs don't - they often use the actual number range. So see if directly specifying the VST version of ProQ helps.

If not and it's not a linear mapping that scale will help with, then maybe try using a combo of ftom (in case it uses same scaling as musical pitch) and scale.

If that doesn't work, I'd approximate by getting some data points - lets say, take a reading of ProQ's freq every 0.1 step of the parameter, then plug that data into a function object as x,y pairs and run your numbers through it.

Scale isn´t useful. It is not linear and other workarounds dosn´t work.

f = 10. to 30000. Hz // Scale 10. 30000. 0. 1. 0.5 @classic

I think it is splitted in 3 parts from somthing about 10. to 300. // 300. to 1000. // 1000. to 30000.

I think i need some other stuff to fix this...

Same Problem here.
Scale isn´t useful. It is not linear and other workarounds dosn´t work.
f = 10. to 30000. Hz // Scale 10. 30000. 0. 1. 0.5 @classic
but i get wrong frequencies... 

I think it is splitted in 3 parts from somthing about 10. to 300. // 300. to 1000. // 1000. to 30000. 

dont know how to do that correctly.
I think i need some other stuff to fix this...

please help,
thanks ,
Oscar

Have you tried scaling modes other than classic?

the frequency part can always be solved by mtof/ftom when you dont know the right formula offhand. the rest is linear scaling. i wouldnt like to make up a log or exponential magig number since it will depend on the frequency range.

rather i´d´use the range of one of the two "standard" linear to frequency conversions, which are centered around the lowest midi key (key number 0 == 8.17 Hz) or a key of your choice (like in later versions of mtof)

the only uncertainty left is what the VSTs author used as low and high limit; his GUI might reflect slighty different values than what is actually happening inside in some cases.

par2hzrange.png

damn, just noticed you need it the other way round (of course).

Hertz
|
[ftom 0.]
[zmap 3.48682 142.095779 0. 1.]
|
Parameter


i will try it out these days. But the stylish way looks great for me.

could be, that i get some problems to find out wich frequency ist the right float out of the vst.

i will try ftom object! thanks for the screenshot...

i will try it out these days. But the stylish way looks great for me.
could be, that i get some problems to find out wich frequency ist the right float out of the vst.

@ MAX GARDENER :
i tried booth modes, sure

@ ROMAN THILENIUS :
i will try ftom object! thanks for the screenshot...

Setting cutoff frequency in Hertz using vst~ fabfilter pro q 2