[HELP] Filter several AudioSource individualy

Hi guys, i’m still a Beringen with JUCE an im struggling with an issue.

I’m trying to make a simple plugin that mix and play severals Audio files.

i have severals AudioSource that goes in a MixerAudioSource, So far everything works fine.

BUT, il want to add the possibility to filter them individualy.
so i looked into the IIR Filter class and IIRFilterAudioSource class but i can’t find a way to implement them to do what i wan’t.

I managed to make it filter the global output signal but not to filter the signal of a single AudioSource.

any suggestions ?