Hi,
On 10/11/2014 07:32 PM, Tristan Chambers wrote:
I picked up an Echo Audio Echo 2 USB Interface. The product specs list iPad support through camera connection kit, so I assume it is class compliant. http://echoaudio.com/blogs/news/6454472-echo-digital-audio-introduces-the-ec...
However, on most systems when I plug the device in, it shows up in my sound settings panel under the Input tab, but not under the Output tab.
Recording works. I can successfully record with arecord -vv -fdat -D "plughw:CARD=Audio,DEV=0" echo.wav. I also can increase the sample rate by changing the flags. I verified that the sample rate actually increases by recording a 50khz test tone into the input and examining the wave form in an editor. It's there! So this is very promising. (anyone know of a test to verify bit depth? I want to make sure it's actually recording at 24bits.)
Playback however, is nothing but trouble. Like I said, the output device doesn't show up in the Output tab in my sound settings (gnome/pulse). However, when I list devices and available PCMs with aplay -l and aplay -L the device shows up on the lists. See specimens #1, #2, and #3. When I try to play though I get about a 1/4 second of audio and then nothing, and subsequent attempts to play sound output nothing. The device then must be unplugged and plugged back in. I'm playing with the command aplay -vv foo.wav --device="plughw:CARD=Audio,DEV=0". See output screen on specimen #4.
Any messages in dmesg when you try this? And does PulseAudio generate any logs that look suspicious? The output of 'lsusb -v' might also be helpful.
Daniel