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NanoPi M1Plus Integrated Microphone how to configure

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hello
this is my alsa mixer

Card: sndhdmi F1: Help │
│ Chip: F2: System information │
│ View: F3: Playback F4:[Capture] F5: All F6: Select sound card │
│ Item: Esc: Exit │
│ │
│ │
│ │
│ This sound device does not have any capture controls. │

with the command: sox -t alsa default test.wav ; the system takes a record but it records only silent.
how can I use the integrate hardware microphone? I am running the Debian image, there is a GUI application, for voice recording, that can I install and use? I state that I need the audio output is functioning on HDMI
sorry for my English
thanks
Hi,
Debian system's default audio output is the 3.5mm audio jack. You can turn on the HDMI audio by editing the /etc/asound.conf file:

pcm.!default {
type hw
card 1
device 0
}

ctl.!default {
type hw
card 1
}

card 0 points to the 3.5mm audio jack and card 1 points to the HDMI audio. You need to save your changes and reboot your system to make your changes take effect.

thank you!

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