Detecting silence in audio

I use the AVfoundation plugins by MBS.

Now, I have been wondering if I could use it to detect silence.

I guess the input needs to be tweaked in order to set some kind of threshold. So, that a hum in the background noise is not detected. (by using compressor / noise-gate filters, I think)
Also, there may need to be filters set to do some basic EQ, in case I want to detect audio in the frequency bands of a human voice,

Is there anyone out there with some experience with these plugins?
Especially setting up filters.