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Last Edition the 27th of June 2023
I.Software
1. Editor On Fire (EOF)
It is the core of where the magic happens, it was created as a companion to Frets On Fire quite some time ago to allow users to create their own charts and has evolved a lot since then to allow the creation of compatible customs songs for the Guitar Hero games, Phase Shift, Bandfuse, Rock Band and of course Rocksmith and Rocksmith 2014 Remastered or not.
You can find this software over at : https://ignition4.customsforge.com/eof (You will need full release + hotfix)
2. DLC Builder
Without it, things would be a bit more complicated, it automates the whole packaging process and creates all of the files that are needed for Rocksmith to be able to read and play everything according to plan. It involves a lot to properly translate the files from EOF to the proper file format that Rocksmith can then interpret correctly. It also add Dynamic Difficulty as well as some quality check and is the place to manage tones.
You can find this software over at : https://github.com/iminashi/Rocksmith2014.NET/releases
3. WWise
Rocksmith uses the WWise file format for reading and navigating through audio files, so we will need it to convert our OGG files to the WEM format. Luckily the DLC Builder does it all on his own properly but we still need to have the software to do the encoding (like you would need the Lame encoder to encode in MP3).
You can download the 2021 installer from here : https://ignition4.customsforge.com/tools/wwise
The DLC Builder support WWise 2019 and 2021.
4. Other tools that can be quite useful
a. Vocals synchronisation
I would suggest using Ultra Star Creator because it has a practical interface and it allows you to quickly and simply sync vocals to the audio and then import them without any issues into EOF :
https://sourceforge.net/projects/usc/
An alternate lyrics editor that offer a more visual approach is YASS though it is suggested to work from an existing MIDI file that has the vocal melody :
https://yass-along.com/
You can also find existing lyrics file from the UltraStar Database (free account is required) :
https://usdb.animux.de/
b. Guitar tab editing software
I personally use Guitar Pro to edit and make adjustments to the tab that I will later import into EOF, but EOF can edit the tab too. I just find most parts of the tab editing process to be easier in Guitar Pro than in EOF. That is really a personal matter and I won’t talk about how to use Guitar Pro or Tux Guitar (for those who prefer a free Linux compatible tab editor in this whole tutorial. Just be aware that TUX doesn't correctly export the special techniques that Rocksmith can use the same way Guitar Pro does, meaning you'll have to add them in manually within EOF). I still prefer that people know they can use a different tool to do part of the tab editing, instead of being locked in a software they might not find practical.
http://www.tuxguitar.com.ar/
https://www.guitar-pro.com/