[alsa-devel] Echo Audio Echo 2 USB Interface

[Daniel Mack]

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-echo-2-usb-audio-interface
> 
> 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