float lowpassFreq = clamp(20000.f * colorFreq, 20.f, 20000.f);
lowpassFilter.setCutoffFreq(lowpassFreq / args.sampleRate);
lowpassFilter.process(wet);
wet = lowpassFilter.lowpass();
float highpassFreq = clamp(20.f * colorFreq, 20.f, 20000.f);
highpassFilter.setCutoff(highpassFreq / args.sampleRate);
^^^^^^^^^
highpassFilter.process(wet);
wet = highpassFilter.highpass();