Portable Bluetooth Chord Controller for iPhone & GarageBand

Turn your iPhone into a compact music-making setup.

This handheld Bluetooth chord controller gives creators a convenient set of physical keys for playing common chords, individual notes, and rhythmic patterns in GarageBand. Its compact body is 3D printed and manually assembled, making it suitable for casual practice, mobile music creation, demonstrations, and experimental electronic-instrument projects.

Physical Controls for Mobile Music Creation

Instead of relying entirely on a touchscreen, you can use responsive mechanical keys to trigger chord and note functions. The controller includes two groups of commonly used chords, a single-note mode, transpose controls, and rhythm adjustment.

Key Features

• Common chord controls: Two selectable groups covering eight commonly used chord positions.
• Single-note mode: Switch from chord playing to individual-note control.
• Transpose adjustment: Move the playing range up or down using dedicated controls.
• Rhythm adjustment: Change supported rhythm settings directly from the controller.
• Mechanical key switches: Transparent keycaps provide clear tactile feedback.
• Compact handheld format: Designed for portable practice and desktop music setups.
• ESP32-based electronics: Built around a programmable ESP32 control board.
• Upgradeable firmware: Future functions may be added through firmware updates where supported.

How It Works

1. Power on the controller using the supported USB power connection.
2. Open GarageBand on your iPhone.
3. Connect the controller through the supported Bluetooth connection.
4. Select the desired chord, note, transpose, or rhythm mode and begin playing.

Designed For

• GarageBand users
• Beginner music practice
• Mobile music creators
• Electronic-instrument enthusiasts
• Cosplay, video, and performance props requiring interactive controls
• Maker and ESP32 projects

Handmade Product Notice

This is an early-stage, manually assembled product with a 3D-printed enclosure. Small layer lines, surface marks, visible wiring, or minor cosmetic differences may occur between units. These characteristics do not affect normal operation and should be expected from a small-batch handmade product.

What's Included

• 1 × Handheld Bluetooth chord controller

Before ordering: Please confirm your iPhone model, iOS version, connection port, intended app, and power requirements with us. Cable, power bank, phone, and other accessories are not included unless explicitly stated in the selected option.

Product functions and appearance may change as the hardware and firmware continue to be developed. This product is not a standalone guitar and does not generate audio without a connected compatible device and app.