This message was posted on behalf of Intel Corporation
What image are you using in the Edison? What USB sound card are you using? There’s a very useful guide to record Audio on the Edison using the arecord command. You can see more information here http://www.intel.com/content/www/us/en/support/boards-and-kits/intel-edison-boards/000018268.html .
Let us know if you’re able to record audio with this approach.