To confirm, do you have a MATRIX Creator or MATRIX Voice?
Can you send me the output of
sudo xc3sprog -j -c sysfsgpio_creator
Additionally, since it seems you have the MATRIX kernel modules installed, can you send me the output of
arecord -l and let me know if recording audio with the following command works?
arecord recording.wav -D hw:MATRIXIOSOUND -f S16_LE -r 16000 -d 5
Please also create a new thread with your outputs so as not to bother the community member above. Thanks!