Using gnuradio blocks lets one move towards working with open freedom communities.
Gnuradio blocks are all documented at the gnuradio wiki.

Everyone's goal of course is a general-purpose workbench, but you have to start somewhere.

Pad Crop Block:
    This is useful for organising wave periods together while adjusting theorised periods.
            note: there may be helpful blocks under Resamplers to shrink the waves for display if the sample rate is high
                  rescaling could also be added to pad/crop, or sdl video, but gnuradio's way seems to be to use a hier block to move towards user design
    Connect these:
        Stream Tag Tools->Stream to Tagged Stream
                        configure this to guess the period of the waveform
        openemissions->Tagged Stream Pad/Crop
        Video->Video SDL Sink
                        configure the pad/crop block to output the periods aligned with the video width
                        now any similarities between them are visually clear as vertical bars

PiGPIO Sink Block:
    This is useful for driving hardware based on a time-synchronised signal.
    In Karl's noiscillate experiment, he has a noise generator connected via a relay to a raspberry pi pin.
    
    Connect these:
        Waveform Generators->Signal Source
                        configure to a square wave with a low frequency
        openemissions->PiGPIO Sink
                        oscillate power to a device using a relay
                        now the same flowgraph can be used mathematically to compare the signal environment with and without the device powered