Build an AI Voice Changer App with AI Pass SDK

Learn to build a voice transformation application using the AI Pass platform. Complete tutorial with code examples.

EiliyaMarch 2, 20264 min read

Build an AI Voice Changer App with AI Pass SDK

Learn how to build a voice transformation application using the AI Pass platform. This tutorial covers everything from signup to deployment.

Prerequisites

Basic knowledge of HTML, CSS, and JavaScript
A code editor (VS Code, Sublime Text, etc.)
A modern web browser

Step 1: Sign Up for AI Pass

Go to AI Pass
Click "Sign Up" and create your account
You'll receive $1 free credit on signup to test the platform

Step 2: Get Your Client ID

Navigate to the Developer Dashboard
Go to OAuth2 Clients section
Click "Create New Client"
Give your app a name (e.g., "My Voice Changer")
Copy your Client ID — you'll need this for the SDK

Important: Keep your Client ID secure. In production, use environment variables.

Step 3: Include the AI Pass SDK

Add the AI Pass SDK to your HTML file:

<script src="https://aipass.one/aipass-sdk.js"></script>

Step 4: Initialize the SDK

Initialize the SDK with your Client ID and enable user authentication:

// Initialize AI Pass SDK
const client = new AiPass({
  clientId: 'YOUR_CLIENT_ID',
  requireLogin: true  // Requires users to log in to use your app
});

// Check if user is authenticated
client.on('ready', () => {
  console.log('SDK ready, user authenticated:', client.isAuthenticated());
});

Step 5: Create the Voice Changer Function

Use the AI Pass API to transform voice recordings:

async function changeVoice(audioFile, voiceStyle) {
  try {
    // Check user credits before processing
    const credits = await client.getUserCredits();
    if (credits.available < 1) {
      alert('Not enough credits. Please upgrade your plan.');
      return null;
    }

    // Convert audio to base64
    const reader = new FileReader();
    const base64Audio = await new Promise((resolve) => {
      reader.onload = () => resolve(reader.result);
      reader.readAsDataURL(audioFile);
    });

    // Call the voice transformation model via AI Pass
    const result = await client.generateCompletion({
      model: 'gpt-5-mini',
      temperature: 1,
      max_tokens: 16000,
      messages: [
        {
          role: 'system',
          content: 'You are an audio processing assistant. Transform voice recordings to different styles while maintaining natural speech patterns and emotions. Supported styles: professional, casual, playful, deep, soft, energetic.'
        },
        {
          role: 'user',
          content: `Transform this audio to ${voiceStyle} style: ${base64Audio}`
        }
      ]
    });

    return result;
  } catch (error) {
    console.error('Error changing voice:', error);
    throw error;
  }
}

Critical: Always include temperature: 1 and max_tokens: 16000 when using GPT-5 models. The SDK defaults (temperature: 0.7, max_tokens: 1000) are incompatible with GPT-5's reasoning process and will result in empty responses.

Step 6: Build the User Interface

Create a simple HTML interface:

<!DOCTYPE html>
<html>
<head>
  <title>AI Voice Changer</title>
  <style>
    body { font-family: Arial, sans-serif; max-width: 600px; margin: 50px auto; padding: 20px; }
    .upload-area { border: 2px dashed #ccc; padding: 40px; text-align: center; cursor: pointer; }
    .upload-area:hover { border-color: #007bff; }
    .controls { margin: 20px 0; }
    select, button { padding: 10px; margin: 5px; }
    #result { margin-top: 20px; }
    audio { width: 100%; }
  </style>
</head>
<body>
  <h1>AI Voice Changer</h1>
  <div class="upload-area" onclick="document.getElementById('fileInput').click()">
    <p>Click to upload audio</p>
    <input type="file" id="fileInput" accept="audio/*" style="display: none" onchange="handleFileUpload(event)">
  </div>

  <div class="controls">
    <select id="voiceStyle">
      <option value="professional">Professional</option>
      <option value="casual">Casual</option>
      <option value="playful">Playful</option>
      <option value="deep">Deep</option>
      <option value="soft">Soft</option>
      <option value="energetic">Energetic</option>
    </select>
    <button onclick="processAudio()">Transform Voice</button>
  </div>

  <div id="result"></div>

  <script src="https://aipass.one/aipass-sdk.js"></script>
  <script>
    const client = new AiPass({
      clientId: 'YOUR_CLIENT_ID',
      requireLogin: true
    });

    let uploadedAudio = null;

    function handleFileUpload(event) {
      uploadedAudio = event.target.files[0];
      if (uploadedAudio) {
        document.getElementById('result').innerHTML = `
          <p>Original:</p>
          <audio controls src="${URL.createObjectURL(uploadedAudio)}"></audio>
        `;
      }
    }

    async function processAudio() {
      if (!uploadedAudio) {
        alert('Please upload an audio file first');
        return;
      }

      const voiceStyle = document.getElementById('voiceStyle').value;
      const resultDiv = document.getElementById('result');
      resultDiv.innerHTML = '<p>Processing...</p>';

      try {
        const result = await changeVoice(uploadedAudio, voiceStyle);
        resultDiv.innerHTML = `
          <p>Transformed (${voiceStyle}):</p>
          <audio controls src="${result.data.processedAudio}"></audio>
          <br><br>
          <a href="${result.data.processedAudio}" download="transformed-audio.mp3">Download</a>
        `;
      } catch (error) {
        resultDiv.innerHTML = `<p>Error: ${error.message}</p>`;
      }
    }

    async function changeVoice(audioFile, voiceStyle) {
      // ... (function from Step 5)
    }
  </script>
</body>
</html>

Step 7: Deployment Options

Option A: Self-Host Anywhere

Deploy your app to any web hosting service:

Netlify - Drag and drop your HTML file
Vercel - Connect your Git repository
GitHub Pages - Free hosting for static sites
Your own server - Nginx, Apache, or any web server

Option B: Publish on AI Pass Catalog

Publish your app to the AI Pass marketplace and earn revenue:

In the Developer Dashboard, go to My Apps
Click "Publish to Catalog"
Set your pricing (per-use or subscription)
Submit for review
Once approved, your app appears in the catalog

Earning Opportunity: You earn 50% commission on all revenue generated through the AI Pass catalog. This includes revenue from users who discover your app through the marketplace.

Step 8: Test Your App

Open your app in a browser
Sign in with your AI Pass account (or create one)
Upload an audio file
Select a voice style
Verify the transformation works
Test different voice styles

Complete Example Code

For a complete working example, check out the AI Pass SDK documentation.

Next Steps

Add real-time voice recording capability
Implement custom voice presets
Add audio format conversion
Publish to the catalog to earn revenue
Explore other AI Pass models and APIs

Happy building! 🎤

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