What software do you use to change or add promotions to older podcast episodes? Is there a way to automate the process, or do you have to go through and change each one manually?

Our podcast hosting company, Libsyn, has a feature called Advertising Slots that allows us to easily update, add, or change our promotions WITHOUT having to manually go back through each episode. This is a great opportunity to add in webinar or cart open promotions during your launch.  

Buzzsprout, another great podcast hosting platform also has what they call a Dynamic Content tool that lets you easily add and remove short pre-roll, mid-roll, and post-roll content to new or existing podcast episodes easily.