Can't get/find "speak" or "voice" boxes/options

Hi, no matter what I do with the settings in my project I can't seem to get an option to have a voice or speak box become available. I am attempting to build, essentially, a "sound board" type of application for a sales use case. It will be a "decision tree" format where I can choose between text to speech (I have an elevenlabs integration/account) and just playing a pre-recorded audio clip. I figured out how to make the text to speech work fine but I don't have any options/choices for "speak/audio" boxes and I only have "message" options (not "voice") when creating a block. PLEASE advise.