Control of a single spot break (or all spot breaks within a predefined time period) can be dynamically split between different ad management servers, and between universal and targeted advertisements. Put another way, the particular type of process used to deliver advertisements (e.g. one-to-many or one-to-one) can be varied within a single spot break. Each portion of a split spot break can be dynamically adjusted in near-real time. If run time of advertisements inserted by an ad management server is either too long or not long enough, control can be passed to the next ad server late, or early, as appropriate. A single spot break (or group of spot breaks) can be split different ways for different stations, or for different tiers of spot breaks. Different spot breaks on the same station can be split differently.