Hello, I am using an 8 channel USB sound card as an audio source and the first test I do is to ensure that the audio signals can be seen in the attached QT scope block screen shot. This works perfectly when the PC is first started, however when I stop the flow graph and then start it again I get an alsa error message.
When the flow graph is working correctly I get the following message: <<< Welcome to GNU Radio Companion 3.7.5git-0-g2bb2b314 >>> Preferences file: /home/drdc/.grc Block paths: /home/drdc/target/share/gnuradio/grc/blocks /home/drdc/.grc_gnuradio Loading: "/home/drdc/Documents/8 ip switch test.grc" >>> Done Showing: "/home/drdc/Documents/8 ip switch test.grc" Generating: "/home/drdc/Documents/InputSwitchTest.py" Generating: "/home/drdc/Documents/InputSwitchTest.py" Executing: "/home/drdc/Documents/InputSwitchTest.py" Using Volk machine: avx_32_mmx >>> Done After the flowgraph is restarted I get the error message that can be seen in the attached screen shot. Some background: To get the USB sound card to work at all I have
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