List the voices available to speak with: the ready-made library voices plus every voice this account has cloned or designed. Each one comes back with its voice_id (pass that to the speaking tools), its name, whether it is ready-made or one of your own, labels saying who it sounds like (gender, age, accent, what it suits) and a preview_url that plays a short sample. Optional search matches a name or a description, for example "warm female narrator" or "deep british male". Set mine_only true to see only the voices you made yourself. count defaults to 30 (max 100). Free and read only.