ReSpeaker 6-Mic Circular Array cannot play the sound recorded when Aloop is running

Hi
I used ReSpeaker 6-Mic Circular Array to run Aloop.
Although the operation is very successful, KWS is functioning normally and beamforming can be heard from the recorded sound is also functioning normally.
But it has been unable to use the terminal to play the recorded sound.
I have tried many kinds of codes but none of them can play sound.
The code used is approximately like the following
arecord -Dhw:Loopback,1,0 -c 8 -r 16000 -f S16_LE loop_test.wav | aplay -Dhw:Loopback,1,0 -r 16000
I would like to ask what can I do to play the sound recorded when Aloop is running?