You may not hear an ad 100% of the time in 100% of your ad insertion points.  Ad fill can rely on a few things, (Fill rate is a metric calculated by dividing the total number of successful impressions by the number of requests).  Below are some reasons you may not hear an ad all of the time

  1. No Campaigns
  2. Geography
  3. Time of day 
  4. Season
  5. Demographics
  6. Advertiser Interest
  7. Listener Platform

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