https://techcrunch.com/2021/04/27/instreamatic-which-inserts-interactive-voice-ads-into-audio-streams-raises-6-1m-series-a-round/

Interactive voice advertising startup Instreamatic, which can insert interactive voice ads into an audio stream, has raised $6.1 million in a Series A funding led by Progress Ventures led the round, joined by Accomplice, and Google Assistant Investments.

SF-HQ’d Instreamatic lets brands that advertise through streaming music apps and podcasts (for instance) have interactive voice-based dialogues with consumers. So instead of an audio ad playing in a one-way experience (as all adverts currently do), the listener can talk to, and interact, with the ad.