AI Voice Generation

Generate natural AI voices via inference.sh CLI.

Quick Start

Requires inference.sh CLI (belt ). Install instructions

belt login

Generate speech

belt app run infsh/kokoro-tts --input '{ "prompt": "Hello! This is an AI-generated voice that sounds natural and engaging.", "voice": "af_sarah" }'

Available Models

Model App ID Best For

ElevenLabs TTS elevenlabs/tts

Premium quality, 22+ voices, 32 languages

ElevenLabs Voice Changer elevenlabs/voice-changer

Transform existing voice recordings

Kokoro TTS infsh/kokoro-tts

Natural, multiple voices

DIA infsh/dia-tts

Conversational, expressive

Chatterbox infsh/chatterbox

Casual, entertainment

Higgs infsh/higgs-tts

Professional narration

VibeVoice infsh/vibevoice

Emotional range

Kokoro Voice Library

American English

Voice ID Gender Style

af_sarah

Female Warm, friendly

af_nicole

Female Professional

af_sky

Female Youthful

am_michael

Male Authoritative

am_adam

Male Conversational

am_echo

Male Clear, neutral

British English

Voice ID Gender Style

bf_emma

Female Refined

bf_isabella

Female Warm

bm_george

Male Classic

bm_lewis

Male Modern

Voice Generation Examples

Professional Narration

belt app run infsh/kokoro-tts --input '{ "prompt": "Welcome to our quarterly earnings call. Today we will discuss the financial performance and strategic initiatives for the past quarter.", "voice": "am_michael", "speed": 1.0 }'

Conversational Style

belt app run infsh/dia-tts --input '{ "text": "Hey, so I was thinking about that project we discussed. What if we tried a different approach?", "voice": "conversational" }'

Audiobook Narration

belt app run infsh/kokoro-tts --input '{ "prompt": "Chapter One. The morning mist hung low over the valley as Sarah made her way down the winding path. She had been walking for hours.", "voice": "bf_emma", "speed": 0.9 }'

Video Voiceover

belt app run infsh/kokoro-tts --input '{ "prompt": "Introducing the next generation of productivity. Work smarter, not harder.", "voice": "af_nicole", "speed": 1.1 }'

Podcast Host

belt app run infsh/kokoro-tts --input '{ "prompt": "Welcome back to Tech Talk! Im your host, and today we are diving deep into the world of artificial intelligence.", "voice": "am_adam" }'

Multi-Voice Conversation

Generate dialogue between two speakers

Speaker 1

belt app run infsh/kokoro-tts --input '{ "prompt": "Have you seen the latest AI developments? Its incredible how fast things are moving.", "voice": "am_michael" }' > speaker1.json

Speaker 2

belt app run infsh/kokoro-tts --input '{ "prompt": "I know, right? Just last week I tried that new image generator and was blown away.", "voice": "af_sarah" }' > speaker2.json

Merge conversation

belt app run infsh/media-merger --input '{ "audio_files": ["<speaker1-url>", "<speaker2-url>"], "crossfade_ms": 300 }'

Long-Form Content

Chunked Processing

For content over 5000 characters, split into chunks:

Process long text in chunks

TEXT="Your very long text here..."

Split and generate

Chunk 1

belt app run infsh/kokoro-tts --input '{ "prompt": "<chunk-1>", "voice": "bf_emma" }' > chunk1.json

Chunk 2

belt app run infsh/kokoro-tts --input '{ "prompt": "<chunk-2>", "voice": "bf_emma" }' > chunk2.json

Merge chunks

belt app run infsh/media-merger --input '{ "audio_files": ["<chunk1-url>", "<chunk2-url>"], "crossfade_ms": 100 }'

Voice + Video Workflow

Add Voiceover to Video

1. Generate voiceover

belt app run infsh/kokoro-tts --input '{ "prompt": "This stunning footage shows the beauty of nature in its purest form.", "voice": "am_michael" }' > voiceover.json

2. Merge with video

belt app run infsh/media-merger --input '{ "video_url": "https://your-video.mp4", "audio_url": "<voiceover-url>" }'

Create Talking Head

1. Generate speech

belt app run infsh/kokoro-tts --input '{ "prompt": "Hi, Im excited to share some updates with you today.", "voice": "af_sarah" }' > speech.json

2. Animate with avatar

belt app run bytedance/omnihuman-1-5 --input '{ "image_url": "https://portrait.jpg", "audio_url": "<speech-url>" }'

Speed and Pacing

Speed Effect Use For

0.8 Slow, deliberate Audiobooks, meditation

0.9 Slightly slow Education, tutorials

1.0 Normal General purpose

1.1 Slightly fast Commercials, energy

1.2 Fast Quick announcements

Slow narration

belt app run infsh/kokoro-tts --input '{ "prompt": "Take a deep breath. Let yourself relax.", "voice": "bf_emma", "speed": 0.8 }'

Punctuation for Pacing

Use punctuation to control speech rhythm:

Punctuation Effect

Period .

Full pause

Comma ,

Brief pause

...

Extended pause

!

Emphasis

?

Question intonation

Quick break

belt app run infsh/kokoro-tts --input '{ "prompt": "Wait... Did you hear that? Something is coming. Something big!", "voice": "am_adam" }'

Best Practices

• Match voice to content - Professional voice for business, casual for social

• Use punctuation - Control pacing with periods and commas

• Keep sentences short - Easier to generate and sounds more natural

• Test different voices - Same text sounds different across voices

• Adjust speed - Slightly slower often sounds more natural

• Break long content - Process in chunks for consistency

Use Cases

• Voiceovers - Video narration, commercials

• Audiobooks - Full book narration

• Podcasts - AI hosts and guests

• E-learning - Course narration

• Accessibility - Screen reader content

• IVR - Phone system messages

• Content localization - Translate and voice

Related Skills

ElevenLabs TTS (premium, 22+ voices)

npx skills add inference-sh/skills@elevenlabs-tts

ElevenLabs voice changer (transform recordings)

npx skills add inference-sh/skills@elevenlabs-voice-changer

All TTS models

npx skills add inference-sh/skills@text-to-speech

Podcast creation

npx skills add inference-sh/skills@ai-podcast-creation

AI avatars

npx skills add inference-sh/skills@ai-avatar-video

Video generation

npx skills add inference-sh/skills@ai-video-generation

Full platform skill

npx skills add inference-sh/skills@infsh-cli

Browse audio apps: belt app list --category audio