But there is some difference between 19.04 and 18.04, after installing 18.04, the aplay/arecord default device pulseaudio, while after installing the 19.04, the aplay/arecord default device is hw sound card.
Please install 19.04 to a different machine (not x1 carbon), let us see if the default device will change to pulseaudio or not.
Just tested, the voice recorded is OK.
But there is some difference between 19.04 and 18.04, after installing 18.04, the aplay/arecord default device pulseaudio, while after installing the 19.04, the aplay/arecord default device is hw sound card.
Please install 19.04 to a different machine (not x1 carbon), let us see if the default device will change to pulseaudio or not.