[nhaliday]

Or just pay MTurk workers to annotate texts with intonation cues.

I kinda doubt that would be profitable relative to just hiring readers, but in general you don't need to replace workers completely to cannibalize some of their wages/jobs.

[CamperBob2]

Or treat it as part of the original author's job. When you write a piece of music you add tempo and intensity metadata to the score, so why not do the same when writing a novel?