A Powershell script that uses SoX and fixes the sample rate of the audio files in input to a different one so that the mod won't crash during the compilation od the sound cache

FixAudioFrequenciesForL4DModAudioFiles.ps1

# Loop through each .wav file in the current directory
Get-ChildItem -Path . -Filter *.wav | ForEach-Object {

    # Call sox and trim only the "Sample rate" line. From that line, then, trim the word "Sample rate"
    $sampleRate = [Int32](
        sox --i $_ 
        | Select-Object -Last 7 
        | Select-String -Pattern "Sample rate.*" -AllMatches 
        | ForEach-Object { $_.Matches } 
        | ForEach-Object { $_.Value } 
        | ForEach-Object { $_.Replace("Sample Rate    : ", "") } 
        | ForEach-Object { $_.trim()}
    )

    Write-Output "Sample rate of $_ is $sampleRate"

    # If the sample rate is 22050, convert the file to 22000 and append a timestamp to the filename
    if ($sampleRate -eq 22050) {
        # If the "converted" directory doesn't exists, create it
        if (!(Test-Path "converted")) {
            New-Item -ItemType Directory -Path "converted"
        }
        
        Write-Output "Converting $_ to 44100"
        $newFilename = $_.BaseName + ".wav"
        $outputFile = Join-Path $_.DirectoryName "converted" $newFilename
        & sox $_.FullName -r 44100 $outputFile
    }
}