How to Build a Raspberry Pi MIDI Controller with OpenClaw for Music Production

The DivingBoard project, featured on the Raspberry Pi Foundation blog, demonstrated that a fully functional MIDI controller can be built for around 65 GBP using a Pi Zero 2 W, an Arduino Nano, eight potentiometers, and four rotary encoders. That project solved hardware accessibility for synth control. What it did not solve, and what no existing Pi MIDI tutorial addresses, is the software intelligence gap: routing MIDI signals between multiple devices, selecting patches by description instead of number, and automating repetitive session setup tasks.

This is the gap an AI agent fills. OpenClaw, running on the same Raspberry Pi that handles your MIDI I/O, can execute shell commands through its exec tool, which means it can call ALSA utilities like aconnect and amidi directly. You describe what you want ("route the keyboard to the drum machine on channel 10") and the agent translates that into the correct MIDI connection commands.

The approach works because of two things that are already proven independently. First, Raspberry Pi has been a USB MIDI host since the Pi 2 era. Class-compliant USB MIDI devices are recognized by ALSA drivers the moment you plug them in, no driver installation needed. Second, OpenClaw's Raspberry Pi documentation confirms full shell access and USB device support on Pi 4 and Pi 5 hardware. Combining these two capabilities is a configuration exercise, not a development project.

The 2026 maker scene has pushed Pi MIDI further than knob-and-fader builds. A Hackaday feature from April 2026 showcased DigitSynth, a wearable MIDI controller built on a Pi 5 that uses flex sensors in a glove to control LFO rates and filter cutoffs on a Roland JD-Xi. Projects like these prove the Pi's MIDI capabilities are mature enough for production use, not just prototyping.

The parts list depends on whether you are building a physical controller with knobs and faders or using the Pi purely as a MIDI host and router between existing gear. Both paths share the same base hardware.

Base hardware (required for both approaches):

• Raspberry Pi 5 (4 GB or 8 GB). The Pi 4 (4 GB) works but the Pi 5's separated USB and Ethernet buses prevent the I/O contention that caused MIDI timing jitter on older models
• Official Pi 5 27W USB-C power supply. Underpowered supplies cause USB enumeration failures with MIDI devices
• 32 GB microSD card or NVMe SSD via a base board. An SSD improves boot time and reduces wear from OpenClaw's database writes
• USB MIDI interface or class-compliant USB MIDI devices (keyboards, controllers, synths with USB ports)

Additional hardware for a custom controller build:

• Arduino Nano or Teensy 4.0 for reading analog inputs (the Pi lacks native ADC pins)
• Potentiometers (10K linear taper, B10K) for faders and knobs
• Rotary encoders for scrolling through presets and parameters
• Buttons or toggle switches for transport controls
• An I2C or SPI display (OLED or LCD) for visual feedback
• Breadboard or custom PCB, hookup wire, solder

If you just want MIDI routing and agent control:

Skip the Arduino and input hardware entirely. Plug your existing USB MIDI controller and USB MIDI synth into the Pi's USB ports. The Pi becomes a headless MIDI hub that OpenClaw manages through shell commands. This is the faster path and the one this guide focuses on.

Total cost for the routing-only approach: a Pi 5 kit ($60 to $80) plus whatever USB MIDI gear you already own. The DivingBoard-style custom controller path adds $30 to $50 in components depending on how many knobs and encoders you include.

Start with Raspberry Pi OS Lite (64-bit). The desktop version works but wastes RAM on a GUI you will not use for a headless MIDI host. OpenClaw requires 64-bit, so this is non-negotiable.

After flashing the SD card and booting, install the ALSA utilities that handle MIDI routing:

sudo apt update && sudo apt install -y alsa-utils

Plug in a USB MIDI device and verify the kernel recognizes it:

amidi -l

This lists all connected MIDI ports. A class-compliant USB MIDI keyboard will show up as something like hw:1,0,0 with the device name. If nothing appears, check the USB connection and confirm the device is class-compliant (most modern MIDI controllers are).

To see the MIDI ports available for routing:

aconnect -l

This shows both input and output ports with their client and port numbers. To route MIDI from a keyboard (say, client 20, port 0) to a synth module (client 24, port 0):

aconnect 20:0 24:0

That single command creates a persistent MIDI route. Notes played on the keyboard now reach the synth. The route survives until you disconnect a device or reboot.

For setups with multiple devices, you can create a shell script that establishes all your routes at boot. Save it as /home/pi/midi-setup.sh, make it executable, and call it from a systemd service or cron job. This is exactly the kind of repetitive task that OpenClaw can replace with a natural-language command once the agent is running.

Gadget mode (Pi as a MIDI controller to a DAW):

If you want the Pi itself to appear as a USB MIDI device when plugged into a computer, you need gadget mode. This only works on the Pi's USB-C port (not the USB-A ports) and requires adding dtoverlay=dwc2 to /boot/firmware/config.txt and loading the g_midi kernel module. Your DAW then sees the Pi as a standard MIDI input device. This is useful when the Pi is running a custom controller with physical knobs and sending MIDI to a laptop.

OpenClaw's official Raspberry Pi documentation specifies the Pi 4 or Pi 5 with at least 2 GB of RAM as the recommended hardware. The agent runtime uses 200 to 400 MB of RAM in steady state, leaving plenty of headroom on a 4 GB Pi for ALSA and MIDI routing alongside the agent.

Install Node.js 24 (required by OpenClaw) and then OpenClaw itself:

curl -fsSL https://deb.nodesource.com/setup_24.x | sudo -E bash -
sudo apt install -y nodejs
curl -fsSL https://openclaw.ai/install.sh | bash
openclaw onboard --install-daemon

The onboarding process sets up a systemd service that keeps the OpenClaw gateway running across reboots. It configures Restart=always with a 2-second restart delay, so the agent recovers automatically from crashes or power interruptions.

For the LLM backend, the OpenClaw Pi docs recommend cloud API models rather than running inference locally. A Pi 5 does not have the compute for responsive local LLM inference, especially not while handling real-time MIDI. Configure your preferred provider (Anthropic, OpenAI, or another supported API) during onboarding.

Once OpenClaw is running, connect it to a messaging channel. Telegram is the simplest option: create a bot through BotFather, enter the token during setup, and you can send natural-language commands to your Pi from your phone. This becomes your remote control for the MIDI setup.

The exec tool is the critical piece for MIDI work. It lets OpenClaw run any shell command on the Pi, which means it can call aconnect, amidi, aplaymidi, and any other ALSA utility. You can also schedule recurring tasks using the cron tool, like resetting MIDI routes at the start of each studio session or backing up your configuration files.

Back up your MIDI projects to a workspace that agents and musicians can share

Fastio's Business Trial gives you 50 GB of persistent storage, no credit card required. Upload patch libraries, routing configs, and session files from your Pi, then search them with built-in AI.

Start 14-Day Trial

With both MIDI and OpenClaw running on the same Pi, you can build workflows that would normally require switching between terminal windows, reading device manuals, and memorizing MIDI CC numbers.

Patch selection by description. Most hardware synths organize patches by bank and program number. Finding the right sound means scrolling through menus or consulting a PDF patch list. With OpenClaw, you can describe what you want: "switch the JD-Xi to a warm pad sound in bank B." The agent can look up the correct program change message from a patch list file stored in its workspace and send it using amidi.

MIDI routing changes. Studio sessions often require different routing configurations. Tracking a bass line needs the keyboard routed to a bass synth. Laying down drums needs the same keyboard routed to a drum machine on channel 10. Instead of remembering aconnect syntax and port numbers, you tell the agent: "route the keyboard to the drum machine on MIDI channel 10." The agent runs the appropriate aconnect commands.

Session recording setup. Before recording, you typically need to arm tracks in your DAW, set the tempo, configure a click track, and verify MIDI routing. These steps can be scripted and triggered through OpenClaw. Store your session templates as shell scripts on the Pi, and the agent runs the right one based on your description of what you are working on.

Automated backups. MIDI patch libraries, custom controller mappings, and session configurations are difficult to reconstruct if lost. Using OpenClaw's cron scheduling, you can set up nightly backups of your MIDI configuration directory to a Fastio workspace. The agent archives your ~/.config/midi/ directory (or wherever you store patches and routing scripts) and uploads the archive to persistent cloud storage. If a microSD card fails, which happens, your entire MIDI setup is recoverable.

Multi-device management. Studios with several MIDI devices benefit most from agent control. Manually mapping routes between a keyboard, two synths, a drum machine, and a DAW means tracking dozens of aconnect pairs. Describing the desired signal flow in plain English and letting the agent figure out the port assignments removes that bookkeeping.

MIDI production generates files that need to live somewhere persistent: patch libraries, controller mappings, routing scripts, recorded MIDI sequences, and DAW project files. Local storage on the Pi's SD card is fine for active sessions but fragile for anything you want to keep.

For local-only storage, an NVMe SSD connected to the Pi 5's PCIe interface is more reliable than a microSD card and faster for read-heavy operations like loading large patch libraries. But local storage does not help when you collaborate with other musicians, work across multiple studios, or need to recover from hardware failure.

Cloud storage solves the durability problem. Google Drive and Dropbox work but require manual sync configuration and do not work alongside agent workflows. S3 is durable but requires IAM setup and has no built-in file preview or collaboration features.

Fastio is built for exactly this pattern: an agent running on a Pi that needs persistent, shareable storage. The free plan includes 50 GB of storage, included credits, and 5 workspaces, with no credit card or trial expiration. OpenClaw can interact with Fastio through the MCP server to upload files, organize workspaces, and share projects.

A practical setup looks like this: create a Fastio workspace called "Studio MIDI" and organize it with folders for patches, routing configs, recorded sessions, and DAW projects. OpenClaw's scheduled tasks handle the upload cadence, pushing changed files after each session. When you collaborate with another musician, share the workspace. They get access to the same patch libraries and routing configurations without you emailing ZIP files.

Fastio's Intelligence Mode auto-indexes uploaded files for semantic search. Once your patch library PDFs and session notes are in a workspace with Intelligence enabled, you can ask questions through the Fastio API like "which sessions used the Jupiter-8 pad patch last month" and get answers with citations pointing to the specific files. That is not something a raw S3 bucket or a synced Dropbox folder can do.

For teams, ownership transfer lets an agent build and organize the entire workspace, then hand control to a human producer or band leader. The agent retains admin access for ongoing maintenance while the human owns the content.