How to direct record with Matrix Voice?

I am try to followed instruction from https://github.com/matrix-io/matrix-creator-hal . And run demo applications success.

But when I try to record direct run: "arecord --device=mic_channel8 -r 16000 -c 1 -f S16_LE test.wav"
I get this error:
"ALSA lib pcm_file.c:781:(snd_pcm_file_open) /tmp/matrix_micarray_channel_8 for reading failed: No such file or directory
arecord: main788: audio open error: No such file or directory"
I probably missed something basic in the setup. How to fix this?

Thanks

Hi @codyli2002hk,

To record using arecord you will need to have MALOS service (CORE) running. Please run:

sudo apt-get -y --force-yes install matrixio-malos
sudo reboot

Let me know if it works after this.