Showing a label e.g. Hz, dB using AudioParameterFloat?

[reuk]

withLabel returns a copy of the attributes with the change applied, so this won’t have any effect (the copy is immediately discarded).

AudioParameterFloatAttributes attrib;
attrib.withLabel("Hz");

You should probably write it like this instead:

const auto attrib = AudioParameterFloatAttributes().withLabel("Hz");