curl --request POST \
  --url https://supertoneapi.com/v1/custom-voices/cloned-voice \
  --header 'Content-Type: multipart/form-data' \
  --header 'x-sup-api-key: <api-key>' \
  --form files='@example-file' \
  --form 'name=<string>' \
  --form 'description=<string>'

{
  "voice_id": "voice_123456789"
}