Preparing your music to be loopable

• Place a loop marker

The loop marker can also be adjusted to make the song loop back to a specific segment of the song once the song ends, use this to make the intro only play once

• When exporting you must use these exact export options when exporting, anything not seen here should be able to be changed,
  must be either 16bit or 32bit, 24bit is not supported currently
  

Using the looped version generated by this script

For engines that support wav files with loop points you can just use the file as-is, however not all engines do
so here's how to use it in various engines!

Roblox

Upload your audio and insert it anywhere, then select your audio in studio and run this script in the command bar:

local sampleRate = 48000 -- CHANGE THIS!
local loopStart = 1069557 -- CHANGE THIS!
local loopEnd = 3629556 -- CHANGE THIS!
local selectedAudio = game:GetService("Selection"):Get()[1]
assert(selectedAudio:IsA("Sound"), "You need to select a sound first.")
selectedAudio.PlaybackRegionsEnabled = true
selectedAudio.Looped = true
selectedAudio.LoopRegion = NumberRange.new(loopStart / sampleRate, math.clamp(loopEnd / sampleRate, 0, selectedAudio.TimeLength))
selectedAudio.PlaybackRegion = NumberRange.new(0, selectedAudio.TimeLength - (1 / sampleRate))

replace sampleRate, loopStart and loopEnd with the output of the script.

Godot

Godot doesn't support this correctly as it doesn't allow you to input precise loop points, you can get it close by setting Offset (in the import settings) to loopStart divided by the sampleRate but you will get an audible pop, see: godotengine/godot-proposals#84 and godotengine/godot#87554

Unity

Unity doesn't support audio loop points. you'll need to implement it yourself or use FMOD/an another alternative sound engine that does support it.

Command-line arguments/flags:

• inputFile
• --output-file <path> (specifies the output path, if not specified then the path will be the original file with "(looped)" appended to the end)
• --write-info <yes/no> (writes an additional json sidecar file to be accessed instead of the cli output)