It would be usefull to have FFT plot feature at least for one channel, so i can have some basic idea of what is going on across the frequency spectrum of sampled data. It does not have to be realtime if processor is too slow for this task. Ploting once every second or so can be enough in such case.
Something like this:
![Image](https://www.tmatlantic.com/upload/images/Wind_Blackman_en.gif)