Sentioscope

Speech and voice controls, as each vendor documents them

Hedra: upload a track, or name a voice from the list

Two routes are documented. Audio can be uploaded, which makes the performance a production decision, or speech can be generated inline by naming a voice id drawn from the voices endpoint. The track is required either way. As of 2026-09-22.

Bring a recording, or let the platform make oneThe model requires a waveform. A production can upload one, which puts the read in front of a human before any frame is paid for, or name a voice id and have speech generated inline with the render.How the required audio comes into beingUploadedA recording you ownAuditioned before any frames exist;length follows the takeA voice id, inlineSpeech made with the renderArrives with the picture, so a bad readcosts a generationThe voices endpoint is a catalogue with no page
Fig. 1 Both routes end in the same required input, and they give a director very different amounts of control over what it contains.
Hedra on voice source, statement by statement. Read from the vendor's Character 3 model page and avatar video guide on 2026-09-22.
What the documentation settlesWhat it leaves to a take
Speech can be generated inline by naming a voice id from the voices endpointHow many voices that endpoint holds, and in which languages
Audio videos are driven by audio, and the character lip-syncs to the audio providedWhether an uploaded take outperforms an inline voice on the same line
Omitting the duration makes the result follow the source audioWhether an inline voice produces a predictable length

Inclusion rule. Only statements found on the vendor page named in the caption, and only ones bearing on this one field. Nothing here is filled in from generated output. Order. In the order the statements arrive on the vendor's page.

1Both routes end in the same required input

What makes this row different from a catalogue-only entry is that the catalogue is an alternative to a recording rather than the only option. The model needs a waveform; the vendor will make one if a production does not bring one. That is a convenience with a consequence, because the two routes give a director very different amounts of control.

Uploading means the read was auditioned by a human before any money was spent on frames. Naming a voice id means the read arrives with the render, and a bad one costs a generation to discover.

2An endpoint is a catalogue without a page

Putting the voices behind an endpoint rather than in the documentation means the inventory is current and unreadable at the same time. Current because it cannot go stale against the code; unreadable because a producer deciding whether to use the platform will not call it.

For this register the consequence is that the cell records a route rather than a range. How many voices, in which languages, and how they were made are all outside what the avatar guide publishes.

3The others that hand a production a catalogue

Four more entries answer with something to choose from. This is the only one where choosing is optional because the model will accept a finished recording instead.

  • D-ID — a voice id, or a recording by url.
  • PixVerse — a sample, or a built-in voice.
  • SceneMixer — a preset library, or the user's own recordings.
  • Synthesia — a catalogue voice, or a cloned one.
  • Voice source
    Speech can be generated inline instead of uploaded, by naming a voice id drawn from the voices endpointa catalogue behind an endpointHedra, avatar video guide / recorded 2026-09-22
  • Audio source
    Avatar videos are driven by audio, and the character in the image will lip-sync and move to the audio providedhanded to the model rather than made by itHedra, avatar video guide / recorded 2026-09-22
  • Shot length set by the take
    The audio normally determines the video length, and omitting the duration follows the source audioHedra, avatar video guide / recorded 2026-09-22

4Sources

Read from the Character 3 model page and avatar video guide at hedra.com on 2026-09-22. The same column across every entry is on voice source; everything this vendor publishes about speech is on Hedra. What counts as documented is on how read.