Hi Daniel, I notice that I cannot help you without enough logs with which I can realize what happens. At lease, 'verbose' options for aplay/arecord, '#' nodes in /proc/asound/cardX and dmesg. Additionally, would you please add 'LANG=C' when you get output from software. I cannot read Spanish language... Try in following steps: 1. $ arecord /tmp/test.wav -D hw:UFX1604 -c 16 (I expected you receive 'Available formats' output) 2. $ arecord /tmp/test.wav -D hw:UFX1604 -c 16 -f (here the format, maybe S32_LE) (I expected you receive 'rate is not accurate' output) 3. $ arecord /tmp/test.wav -D hw:UFX1604 -c 16 -f (the same above) -r (got rate) (I expected it will run correctly.) I hope you to do these test when killing pulseaudio. The way is here: https://wiki.ubuntu.com/PulseAudio/Log Regards Takashi Sakamoto o-takashi(a)sakamocchi.jp