MasterChannelGroup & ChannelGroup Question

Hey Guys!
I’m trying to make a Audio Visualizer in Unity. I wonder if i can add FFT DSP to a ChannelGroup which i get from EventInstance using api getChannelGroup, because when i do this, DSP give me nothing.
I already know MasterChannelGroup will do the job.But i need to get the spectrum data from another event.Any advise is welcome.Thank you.

What you want to do should be possible, perhaps share some code to demonstrate what you are doing and what isn’t working?

Thanks for response.I found the error in FMOD.RESULT.I try to get the ChannelGroup during a wrong time when the audio is not completly loaded.Finally I solve the problem by add a EventCallback to the EventInstance.Thus everything goes right.