From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Mack Subject: Re: Echo Audio Echo 2 USB Interface Date: Mon, 13 Oct 2014 16:45:52 +0200 Message-ID: <543BE5A0.1090009@zonque.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail.zonque.de (svenfoo.org [82.94.215.22]) by alsa0.perex.cz (Postfix) with ESMTP id E6C82260463 for ; Mon, 13 Oct 2014 16:45:54 +0200 (CEST) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: alsa-devel-bounces@alsa-project.org To: Tristan Chambers , alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org 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