What is the varispeed method?

The varispeed method involves changing the playback speed of an audio file to alter its pitch. This process naturally changes both the tempo (BPM) and the duration of the clip.

How can I find the speed multiplier for a specific semitone shift?

You can use the `get_speed_rate` tool. Simply provide the number of semitones you want to shift (positive for higher pitch, negative for lower), and it will return the required ratio.

Can I calculate the new BPM after a speed change?

Yes, use the `transform_bpm` tool. By providing your original BPM and the playback ratio, you will get the new tempo.

Pitch Shift Speed Ratio Calculator MCP Connector for Claude

A+

Calculate playback speed multipliers, adjusted durations, and new BPM for pitch shifting via varispeed.

4 tools Official Updated Oct 1, 2026 Official Vinkius Partner

More Details Connect to Claude

The Pitch Shift Speed Ratio Calculator is a specialized utility for audio producers and DJs. It allows you to determine the exact playback speed multiplier, new duration, and adjusted BPM required to achieve specific pitch changes using the varispeed method. By using tools like get_speed_rate, transform_duration, transform_bpm, and reverse_semitone_lookup, you can quickly match the key of two audio loops by speeding up or slowing down playback without needing complex digital signal processing.

audiopitch-shiftbpmvarispeeddj-toolsmusic-theory

Connect to Claude

Subscribe on Vinkius, then add this connector to Claude.ai or Claude Code.

① Claude.ai (web app)

Go to Settings → Connectors → Add custom connector
Paste the MCP endpoint URL below

https://edge.vinkius.com/vk_preview_Gvil2nlWeQ3pxDJEsID2B5IB53i5odDwpG4XrplK/mcp

② Claude Code (terminal)

claude mcp add --transport http pitch-shift-speed-ratio-calculator https://edge.vinkius.com/vk_preview_Gvil2nlWeQ3pxDJEsID2B5IB53i5odDwpG4XrplK/mcp

③ Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "pitch-shift-speed-ratio-calculator": {
      "url": "https://edge.vinkius.com/vk_preview_Gvil2nlWeQ3pxDJEsID2B5IB53i5odDwpG4XrplK/mcp"
    }
  }
}

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