Auto-Chart Engine (ACE)

Overview

Clone Hero is a free rhythm game for PC, inspired by Guitar Hero and Rock Band, that allows players to create and play custom charts for any song. This project seeks to streamline and elevate the charting process by leveraging advanced extraction techniques to generate playable chart files directly from audio tracks. By isolating drum tracks from MIDI files and extracting precise note data, the engine produces highly accurate Clone Hero charts that accurately represent the original MIDI composition. This engine reduces the time required to chart a song, streamlining the creation of multiple songs in Clone Hero.

Links

• CLI Demonstration: https://youtu.be/5lndr9maaSY?si=u9W6KzgyaVSeP5da
• Git Repo: https://github.com/ryan-w-roche/auto-chart-engine

Install Instructions

Dependencies:

1. In the terminal, enter in the following command:

pip install -r requirements.txt

2. Install fluidsynth for your platform:

Windows (Chocolatey):

choco install fluidsynth

Mac (Homebrew):

brew install fluid-synth

Linux (apt):

sudo apt install fluidsynth

Software:

• Moonscraper (testing/BPM editing): https://github.com/FireFox2000000/Moonscraper-Chart-Editor
• Clone Hero (song playability): https://clonehero.net

CLI Usage

The Auto-Chart Engine CLI allows you to extract drum tracks from MIDI files and convert them into .chart files compatible with Clone Hero.

Basic Usage

python -m ace -i /path/to/your/midi/file.mid -o /optional/output/directory

Required Arguments:

• -i, --input_dir: Path to the MIDI file you want to convert

Optional Arguments:

• -o, --output_dir: Directory where output files will be saved (defaults to your Downloads folder)

Example

python -m ace -i "C:/Users/username/Music/my_song.mid" -o "C:/Users/username/Documents/CloneHero"

How It Works

1. The CLI extracts the drum tracks from your MIDI file
2. Generates a new MIDI file containing only the drum tracks (saved with suffix "_DRUMS")
3. Based on the MIDI with the extracted drums, a .wav version of the midi is generated
4. Converts this drum-only MIDI file into a Clone Hero compatible .chart file

Generated Files

When you run the CLI, it produces 3 outputs:

1. A MIDI file containing only the drum tracks (named <original_filename>_DRUMS.mid)
2. A .chart file (named <original_filename>_DRUMS.chart)
3. A folder named artist - <song_name> (ACE)
   • Contains notes.chart and song.wav files for Clone Hero

Drum Mapping

The CLI maps standard drum notes to Clone Hero's drum notes:

• Kick → Line
• Snare → Red note
• Hi-Hat → Yellow cymbal
• 1st Tom → Yellow note
• 2nd Tom → Blue note
• 3rd Tom → Green note
• Crash → Green cymbal
• Ride → Blue cymbal

Troubleshooting

• For best results, use standard MIDI files with proper drum channel mapping (channel 10/9)

Import to Clone Hero Instructions

1. Locate the generated folder titled artist - <song> (ACE)
2. Copy/cut and paste into your Clone Her songs path
3. In Clone Hero, go to Settings → General → Scan Songs → Yes
   • This should create a song.ini file in the folder that was copied into the Clone Hero songs path
4. In the song.ini file is more metadata you can edit, but the important one to edit is the diff_drums which categorizes the song based on drumming difficulty
5. Repeat the process in step 3 to see the drum difficulty change
6. You are now ready to play your newly imported song!