Filter on a Synth's SamplerSound

I would like to know what is the best way to put a Filter on a Synth’s SamplerSound…

Thanks

It depends whether you want to filter the mixed sounds or have a (potentially) time-varying filter per-voice.

I want to filter the mixed sounds for now…
and bind the filter EQ on a slider.

Thanks

I can filter the output now… with a slider bind to the frequency parameter of the filter… lowpas …highpass…
I set my filter in prepareToPlay…hope it’s the right way…

Now I would like to know the min & max values for the other types of parameters… cutOffFrequency, Q, gainFactor…
to set my sliders min/max values correctly…

Thanks,

Spoutnik

… Anyboby ??? on that …

Your post is pretty vague… You might get more help by asking a more concrete question?

The Vinn has written a top notch filter library. Perhaps you should download that and give it a look, it should tell you heaps about filter design and also Juce implementation.