Hi Jacky ,
As far as I understand your question, you are expecting a GUI from the
example, dial_tone.py. But gr.flow_graph is a used for connecting the different
signal processing blocks, and ensures a proper data flow from the source to
sink in the dial_tone.py case. Thus, the target of the program is linking the
signal source with the audio sink. So, since you hear a sound ( a dial tone),
the program executed successfully. If you are looking for a GUI, you can
install GNU radio companion(GRC). Then, you can play with the different signal
processing blocks. I think I have answered your question.
Fasika
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