ElevenLabs AI Voice Changer & Speech-to-Speech (11 Personas & STS Engine) - Apify Actor

Enterprise AI speech-to-speech (STS) voice conversion and audio changer Actor powered by ElevenLabs neural voice models. Converts source voice recordings, podcasts, and audio links into 11 human-like AI voice personas with pitch modulation and speed controls.

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🎙️ Supported 11 ElevenLabs AI Voice Personas Matrix

Voice Key (voice)	Persona Name	Tone & Accent	Best Used For
charlie (Default)	Charlie	Australian Conversational Male	Casual dialogue, podcasts, video voiceovers
christopher	Christopher	Warm, Engaging American Male	Storytelling, audiobooks, character narration
rachel	Rachel	Calm, Professional Female	Corporate presentations, meditation, tutorials
adam	Adam	Deep, Resonant American Male	Trailers, dramatic voiceovers, documentaries
david	David Castlemore	Authoritative Broadcast Male	News reader, formal announcements, executive audio
george	George	Captivating British Storyteller Male	Historical documentaries, audiobooks, drama
bella	Bella	Soft, Expressive Young Female	Story narration, intimate dialogue, characters
antoni	Antoni	Energetic, Crisp Narration Male	Commercials, YouTube shorts, promotional audio
domi	Domi	Friendly, Empathic Female	Customer service, conversational voice bots
josh	Josh	Deep, Engaging & Confident Male	Marketing videos, product explainers, keynotes
elli	Elli	Young, Dynamic & Cheerful Female	Gaming voiceover, lively shorts, animations

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🎛️ Pitch & Speed Modulation Controls

Parameter	Type	Default	Accepted Range / Values	Description
voice	String	charlie	11 Personas listed above	Target ElevenLabs AI voice model persona.
pitch	String	+0Hz	-50Hz to +50Hz (e.g. -35Hz, +40Hz)	Shifts acoustic pitch frequency up or down.
speed	Number	1.0	0.5 to 2.0 (e.g. 0.85, 1.05, 1.3)	Adjusts playback speed multiplier while maintaining pitch.

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🚀 Key Features

• Speech-to-Speech (STS) Voice Transformation: Replaces the vocal identity while preserving original inflection, emotion, breathing pauses, and natural cadence.
• Dual Input Modalities: Convert public audio URL links or upload Base64 encoded audio strings.
• Binary & Base64 Storage: Saves converted Base64 payload in default dataset and writes raw .mp3 audio binary buffer to Key-Value Store (AUDIO.mp3).
• Real-time Acoustic Tuning: Fine-tune pitch (-35Hz deep voice, +40Hz high pitch) and speed (0.85x deliberate, 1.3x fast-paced).

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🎯 What People Use It For

• Video Creators & YouTubers: Anonymize voiceovers or switch character voices across scenes.
• Gaming Studios & Animation: Generate diverse NPC dialogue from single-actor voice tracks.
• Audiobook & Podcast Producers: Convert rough guide tracks into polished character narrations.
• Localization & Dubbing: Voice conversion preserving original acting cadence.

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📌 Decision Rule & Usage Recommendation

Check if status === "success" AND audio_bytes > 0. Extract audio_base64 from the dataset item or download AUDIO.mp3 from the Key-Value Store.

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💡 What Problem Does This Solve?

• "Hiring multiple voice actors for character dialogue or dubbing is extremely costly and slow."
• "Standard text-to-speech engines lose human emotion, breath pauses, and custom acting pacing."
• "Creators who want to narrate content without revealing their personal voice need studio-grade transformation."

ElevenLabs AI Voice Changer converts your existing voice recording into any of 11 world-class voice personas in seconds.

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🔍 Queries This Actor Answers

• How do I change a voice recording to sound like ElevenLabs Adam, Rachel, or Christopher programmatically in Node.js or Python?
• How do I perform Speech-to-Speech (STS) voice conversion in Apify Actors?
• What is an accurate API alternative to ElevenLabs Speech to Speech and Voice Changer?
• How do I convert audio from a public MP3 URL into a new voice actor persona?

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📥 Dedicated Input JSON Examples

Mode 1: Public Audio URL Conversion

{
  "url": "https://www.soundhelix.com/examples/mp3/SoundHelix-Song-1.mp3",
  "voice": "adam",
  "pitch": "+0Hz",
  "speed": 1.0
}

Mode 2: Audio File Upload (Base64 String)

{
  "file": "//NkxAAAAANIAAAAAExBTUVVVVXwv8AA...",
  "voice": "rachel",
  "pitch": "+15Hz",
  "speed": 1.1
}

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📤 Dataset Output Format

Each run outputs clean flattened items to the default dataset and full payload to Key-Value store (OUTPUT):

{
  "status": "success",
  "success": true,
  "service": "ElevenLabs AI Voice Changer & Speech-to-Speech Engine",
  "pipeline": "Audio-to-Audio (STS) Voice Changer",
  "input_type": "audio_url_link",
  "input_filename": "SoundHelix-Song-1.mp3",
  "detected_format": "mp3",
  "input_bytes": 8945229,
  "input_url": "https://www.soundhelix.com/examples/mp3/SoundHelix-Song-1.mp3",
  "voice": "Adam",
  "voice_id": "pNInz6obpgDQGcFmaJgB",
  "voice_category": "Narration",
  "pitch": "+0Hz",
  "speed": 1,
  "audio_format": "mp3",
  "audio_bytes": 76752,
  "audio_base64": "//NkxAAAAANIAAAAAExBTUVVVVXwv8AA..."
}

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⚠️ Failure Context & Error Handling

If no audio URL or Base64 file input is provided:

{
  "success": false,
  "error": "Missing required parameter: either 'url' (public audio link) or 'file' (Base64 audio string) must be provided."
}

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🏷️ Keywords

elevenlabs voice changer, speech to speech actor, ai voice changer api, elevenlabs sts, voice converter api, audio to audio voice changer, voice modulation api, character voice generator, voice actor clone api, apify actor.