Peak parameters doesn't affect the audio file in my EQ

I am making EQ plugin following FreeCodeOrg. And I could make UI which have several parameters such as low-cut freq, high-cut freq, peak freq, peak gain, peak quality. And I used AudioPluginHost to check my parameters affect correctly. I could play the music but peak parameters doesn’t affect the audio file. Anyone have idea?

I pushed my project on github to track which process is problem.

can anyone give me advice??

I think EQ UI is well made. But I can’t find why EQ can’t affect the mp3 file.

It’s quite hard to follow what you are asking?

Do you mean these controls aren’t working?

settings.peakFreq = apvts.getRawParameterValue("Peak Freq")->load();
settings.peakGainInDecibels = apvts.getRawParameterValue("Peak Gain")->load();
settings.peakQuality = apvts.getRawParameterValue("Peak Quality")->load();

Also - your link is to a git diff - maybe if you like the actual source file someone can spot the problem?