---
title: ToolRouter — Agent Use Case Guide
description: Step-by-step guide for completing a task with a specific AI agent using ToolRouter.
url: https://toolrouter.com/tools/voice-transformer/use-cases/modify-voice-pitch/claude
---
# How to Modify Voice Pitch with Claude

Claude makes pitch adjustment an iterative conversation in your terminal. Describe what you want -- "more authoritative" or "sounds about 10 years younger" -- and Claude translates that into precise pitch parameters. It asks clarifying questions about formant preservation and naturalness, then lets you fine-tune with conversational feedback like "a touch deeper" until the result is perfect.

## Setup

claude mcp add toolrouter -- npx -y toolrouter-mcp

## Steps

1. Connect ToolRouter: claude mcp add toolrouter -- npx -y toolrouter-mcp
2. Ask Claude: "Lower the pitch of this voice recording using voice-transformer" and provide the file
3. Claude adjusts the pitch while preserving natural speech quality
4. Request: "A bit deeper" or "Not quite that much -- bring it up slightly"
5. Download the pitch-adjusted recording

## Example Prompt

```
Lower the pitch of this narration by about 15% to give it more authority and gravitas. Keep the timing and natural speech quality intact.
```

## Tips

- Small pitch adjustments (10-20%) produce the most natural results
- Ask Claude to preserve formant structure so the voice sounds natural, not processed
- Test multiple pitch levels to find the sweet spot between original and target
