How do I run Change Audio Speed with Codex MCP?

Codex can use medux_change_audio_speed through Medux MCP to speed up or slow down an audio file. The workflow identifies the exact inputs, reviews the tool arguments, monitors processing, and verifies the returned result.

Codex MCP tutorial · media

How to change audio playback speed with Codex MCP and Medux

Q: Which MCP tool does this tutorial use?

This workflow uses medux_change_audio_speed . Review its arguments before approval and consult the API reference for the current contract.

Use Codex and Medux through MCP to speed up or slow down an audio file. This guide covers input preparation, the approval gate, task monitoring, and a concrete output check.

POST/api/app/v1/process/audio/change_audio_speed

Speed up or slow down an audio file.

Open the Change Audio Speed API reference →

Codex-specific workflow

Run Change Audio Speed as a Codex MCP task

Use the active workspace as the source of truth. Ask Codex to identify the source audio and exact speed multiplier, select medux_change_audio_speed, and keep the Medux task ID and returned output with the rest of the project. Naming the input roles and the expected result prevents an agent from guessing which file should be used where.

Codex prompt pattern

In this workspace, use medux_change_audio_speed through Medux MCP to change audio playback speed.
First inspect and identify the source audio and exact speed multiplier.
Show me the exact tool arguments before execution.
After the task completes, return the speed-adjusted audio and verify that the duration and playback speed match the request and the audio remains complete.

Approval gate

Before approving the call, compare the selected tool, file or asset IDs, ordering, timing, and output settings with the request. If a local filename was mapped to an uploaded Medux file ID, keep that mapping visible so it can be audited later.

Result verification

Let Codex monitor an asynchronous task until it reaches a terminal state, then save or report the speed-adjusted audio. The final check is explicit: confirm that the duration and playback speed match the request and the audio remains complete.

What this tutorial does

Medux operation

Speed up or slow down an audio file.

Agent workflow

Codex selects medux_change_audio_speed, presents the arguments for review, calls Medux, and reports the response.

Before you start

Authentication

Authentication is required via Authorization header.

Preconditions

Upload the source file and create a file reference before calling this endpoint.
Successful requests return a Medux task record immediately. Use the task query or sync endpoints to track completion.
All file inputs must be uploaded and persisted as file references before submission.

Prompt Codex

Start with a clear instruction that names the Medux operation and the intended inputs.

Speed up or slow down an audio file.

Request fields to review

Confirm these values before approving the MCP tool call. The linked API page remains the source of truth for current limits and response semantics.

Field	Type	Requirement	Purpose
`input_file_id`	string	Required	Input audio file id.
`speed`	number	Required	Positive float, e.g. 1.5 for 1.5x speed.
`model_id`	string	Optional	Model Default: change-audio-speed-default.
`title`	string	Optional	Optional task title.

Step-by-step workflow

Connect Medux MCP to Codex

Add the Medux remote MCP endpoint to Codex, provide an authorized credential, and confirm that the medux_change_audio_speed tool is available.

Prepare the required inputs

Prepare the source files, asset IDs, text, or settings required by the operation. Upload local media first when the tool requests file IDs.

Ask Codex to run Change Audio Speed

Use one direct instruction with the intended values. Codex should select the Medux tool and show the proposed arguments before execution.

Review and approve the tool call

Check that the tool is medux_change_audio_speed and that each file ID, task ID, option, and output setting matches your request before approving it.

Check the Medux response

If Medux returns an asynchronous task, let the agent monitor it until completion; otherwise review the immediate response and save any result identifiers or output URLs.

Workflow recap

User goal
  ↓
Codex selects medux_change_audio_speed
  ↓
Review inputs and approve the tool call
  ↓
Medux runs Change Audio Speed
  ↓
Codex reports the response and output

Frequently asked questions

Can Codex use the Medux Change Audio Speed API through MCP?

Codex can call the medux_change_audio_speed Medux MCP tool to speed up or slow down an audio file. This guide covers the required inputs, approval flow, result handling, and the matching API reference.

Which MCP tool does this tutorial use?

This workflow uses medux_change_audio_speed. Review its arguments before approval and consult the API reference for the current contract.