I’m helping a mate get GNURadio 3.2 running on an Ubuntu machine. As a
sanity check I run dial_tone.py and to my surprise it generates a stream
“aU” audio under-run warnings and clicking noises from the speaker. I’ve
used the “-O plughw:0,0” option because that’s always worked for me when
there are rate mismatches but it gives exactly the same result. The only
thing I can think of is that this is running in a VM but otherwise I am
loss to understand what’s happening. Anyone clues?