- Open Steam
- Right click on Resonite in your library
- Select "Properties" and then "Set Launch Options".
- Enter the command you need to use, exactly as it appears above and Run Resonite.
Now, if Resonite is launched via Steam, the custom command line arguments will take effect.
Commands entered via this method will not take effect if Resonite is launched any other way, such as directly launching the Resonite.exe.