

Google Analytics has been expanded to allow users to track the effectivness of their audio ads. The adWords technical blog has a post on it released today :

For the first time, advertisers can now easily track website visits, conversion rates, revenue, transactions, and other metrics generated by Audio Ads campaigns. These metrics are available in the Analytics tab of AdWords accounts, as well as in Analytics accounts.
As you can see in the image below, the Audio Campaign report shows the correlation between your campaign impressions and website traffic, for example. Keep in mind though, that the website traffic may include traffic generated by other channels, not just Audio Ads.
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