From mboxrd@z Thu Jan  1 00:00:00 1970
From: Markus Seeber <markus.seeber@spectralbird.de>
Subject: Re: Getting notification of sound card load
Date: Tue, 8 Sep 2015 19:28:35 +0200
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References: <CAHS8izNFuofTe1Ud7Oa=L0RTtdT-KqnTdoO81ffMjDwH9RiyEQ@mail.gmail.com>
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On 09/08/2015 07:09 PM, Mina Almasry wrote:
> Hi,
> 
> I'd like to get a notification when a new sound card becomes available in
> my system.

You may have a look at udev, especially the monitoring interface of libudev.

I don't know if this is outdated, but maybe have a look here:
http://www.signal11.us/oss/udev/

Best Regards,
  Markus