We are getting reports from advertisers that Google Audio Ads have been added as an option to their Adwords accounts, although we can’t confirm yet that everyone now has the feature (please let us know if you do not see it).
Google is offering $400 in free advertising to Adwords customers.
The service has been in testing since late last year. Advertisers can purchase ad spots on radio stations, paying on a CPM basis. Google will also use professional voice actors to produce your audio ad (most radio stations will also do this for free).
Look for the “Audio Ads” tab in your Adwords account. Screen shots below.