Hardware Controller Mapped to OpenAI Codex (Thinking-Effort Knobs)

Melvin Vivas · X video post · 2026-07-16 · 0:22 · 97 views · Open on X

Topics: AI Dev Tools & Productivity · Level: beginner

Summary

This is a 22-second demo with almost no teaching content. Melvin Vivas shows a Sound Voltex rhythm-game controller (FAUCETWO) mapped to OpenAI Codex, with its knobs used to adjust the model's thinking (reasoning) effort. He quotes an OpenAI Devs post about "Codex Micro." The only spoken line is a sample prompt to Codex: "Is there any dependencies in this project?"

Key points

• OpenAI Codex lets you adjust the model's thinking (reasoning) effort. More effort usually means deeper answers but more time and cost.
• The creator mapped a Sound Voltex controller (FAUCETWO) to Codex and uses its physical knobs to change thinking effort, which he says works "way better for Codex."
• The post quotes an OpenAI Devs announcement about "Codex Micro." The caption doesn't explain what Codex Micro is.
• Example prompt shown: asking Codex whether a project has any dependencies, a quick way to get to know an unfamiliar codebase.
• There's no tutorial or setup guide for the controller mapping. Treat this as inspiration only.

Resources mentioned

• OpenAI Codex · tool · openai.com · paid
  OpenAI's coding agent. In the diagram it writes code, fixes review findings and drives the build loop. The creator also used it to make this video.
  Also in: An agent bot that installs and drives Codex on its own (Melvin Vivas on X · notes), Asking a Coder bot to install Codex (Melvin Vivas on X · notes), Sign in with ChatGPT: Setting Usage Limits for Each App (Melvin Vivas on X · notes), Codex Cloud Environments Must Be Saved & Published Before Use (Melvin Vivas on X · notes) and 240 more
• Codex Micro · tool · openai.com · paid
  Something OpenAI announced for Codex in an OpenAI Devs post. The caption doesn't say what it is.
  Also in: Codex Micro: A Hardware Macro Keyboard for Steering OpenAI Codex (Melvin Vivas on X · notes)
• FAUCETWO Sound Voltex controller · tool · gamo2.com · paid
  A rhythm-game controller with knobs, which the creator repurposed as a physical input device for Codex.
• OpenAI Developers (@OpenAIDevs) · person · x.com · free
  OpenAI's official X account for developer updates, including Codex announcements.

Try this

• Try changing the reasoning/thinking effort in Codex and compare the answer quality and speed on the same prompt.
• Try a prompt like "Are there any dependencies in this project?" to get to know a new codebase quickly.
• Map a physical controller with knobs (e.g. a MIDI or rhythm-game controller) to coding-agent settings such as thinking effort.