Alsa_sink busy

I just noticed that, if listening to an mp3 while trying to run a
gnuradio script that outputs audio, I get the error message:
audio_alsa_sink[plughw:0,0]: Device or resource busy

This appears both with ok_to_block=True and False… I’m using Ubuntu
Should it not be possible to do both? Any ideas?

Dimitris S.
“If you think you’re too small to make a difference, try sleeping with
a mosquito!” - Amnesty International

You might need to set your default ALSA device to be the virtual
device. See for example