Read the statement by Michael Teeuw here.
MMM-AssistantMk2
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 I want to thank @Sean publicly for having helped me privately into solving the issue! :clapping_hands_medium-light_skin_tone: :thumbs_up_medium-light_skin_tone: 
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 i cannot get hotword to detect any sound ? 
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 @citizendevpi 
 More details are needed for detail answer.
 you can setrecord.verbose: truefor checking your mic works properly. But before that, you should confirm there was any other error to issue. Check your error log.
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 @sean arecord: main:788: audio open error: Device or resource busy and where is my error log? 
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 @citizendevpi 
 Your system seems not properly configured to use audio device. that might be not the issue of module itself.
 And you can see the log withpm2 log mm #or your registered process name for MagicMirroror 
 stoppm2thennpm start devin your MM directory.
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 @citizendevpi 
 Anyway,
 You should confirm to check your audio device card and name, and your RPI should be able to run below commands (or similar)arecord -d 5 test.wavor arecord --device plughw:1,0 -d 5 test.wav( plughw:1,0might be different. You should find your proper device card and number witharecord -l)
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 @sean said in MMM-AssistantMk2 & MMM-GAction: arecord --device plughw:1,0 -d 5 test.wav 
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 @citizendevpi said in MMM-AssistantMk2 & MMM-GAction: arecord --device plughw:1,0 -d 5 test.wav That works? If so, you can set your config record.device: "plughw:1,0",
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 @citizendevpi pi@raspberrypi:~ $ arecord -d 5 test.wav 
 Recording WAVE ‘test.wav’ : Unsigned 8 bit, Rate 8000 Hz, Mono
 pi@raspberrypi:~ $ arecord -l)
 bash: syntax error near unexpected token)' pi@raspberrypi:~ $ arecord -1 arecord: invalid option -- '1' Tryarecord --help’ for more information.
 pi@raspberrypi:~ $ arecord --device plughw:1,0 -d 5 test.wav
 ALSA lib pcm_hw.c:1713:(_snd_pcm_hw_open) Invalid value for card
 arecord: main:788: audio open error: No such file or directory
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