Help needed, gain reduction meters

Hi, I'm implementing my compressor and I am stuck with Gain Reduction meters. In my audiofilter class (instantiated by my audiocontroller), i have a property that mirrors gain reduction at every render callback. I would like to pass this value (in realtime) to my viewcontroller in order to update my Meters on the GUI. Now, the fact is that if I use KVO, glitches and pops are appreciated. Should I use the protocol/delegate method? The question is: what is better way to pass a variable "written by DSP" to my ViewController in realtime at every render cycle?

Thank you

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