NBTCB (NeoForge)

NBTCB takes a physical Note Block music arrangement and turns it into a physical command-block music machine that you can actually build and play. It scans an area for Note Blocks, reads their instruments and notes, calculates the corresponding pitches, and converts them into /playsound commands.

The resulting machine is built as a chunk-aligned serpentine layout, with Command Blocks carrying the music and Repeaters connecting the sequence. Rows alternate direction, creating a compact back-and-forth "snake" that follows the music from beginning to end.

The converter searches for a suitable open area before building rather than simply overwriting existing structures. The unused space around the machine remains open, making the finished snake easy to see and inspect.

🎵 Detects Note Blocks within a configurable radius
🎹 Reads instruments and exact pitches
🔊 Generates global /playsound commands (hear it from anywhere)
🧱 Built entirely from vanilla Command Blocks and Repeaters
🐍 Compact serpentine, back-and-forth layout - 15-wide, chunk-perfect
🧭 Chunk-aligned (1-15 fill) - no ugly chunk borders
🛡 Smart placement - searches for open space, doesn't overwrite your builds
🔘 Auto-placed playback button
📊 Reports notes, rows, length in blocks, and chunk coordinates on finish
🧠 Clever bedrock - only under blocks, never under the button

Usage

1. Equip the Transcoder Wrench.

2. Right-click any nearby block with the Transcoder Wrench in your hand.

Use the wrench's interface to set the Scan Radius, which determines how far around you the converter will search for Note Blocks.

3. Click Transcode in the GUI.

The converter scans the selected area, gathers the Note Blocks it finds, and builds the corresponding Command Block machine.

When finished, the converter reports the number of notes transcoded, the number of rows created, the machine's length, and the chunk coordinates where it was generated.

A button is automatically placed at the beginning of the generated machine, giving you an immediate way to start playback.

Inspiration

This project was inspired by SethBling's old-school NBT filter, particularly the idea of taking Minecraft data and turning it into something that can be processed and represented as a physical Minecraft machine.

Rather than simply copying Note Blocks, the converter transcodes the musical information itself—turning the notes and instruments into executable commands and laying those commands out as a physical, chunk-aligned snake.

From Note Blocks → to data → to commands → to a Minecraft machine.

Built for the joy of making Minecraft do ridiculous things.