I have an app that plays music and applies certain filters using the processing tap functionality. Particularly I use LPF and HPF filters. I have sliders that control filter frequencies, which work OK except the filters seem to be very slow to react to any changes. I use AudioUnitSetParameter() from the app's main thread. I think the time for the new frequency setting to have an effect on the audio stream is about 0.3-0.5 sec. I also know it's definitely not the GUI's slowness.
I run my app on OSX 10.10. It's the same delay for both Debug and Release builds.
Firstly, is this normal? And is there a way to make the filter AU's react faster to parameter changes?