Project for humanity, have 1800 text files to search for numbers, do some math, print results to text file

The world (SILENCE TAG="500") as we have created it (SILENCE TAG="500") is a process (SILENCE TAG"250") of our thinking (SILENCE MSEC="1000") It cannot be changed (SILENCE TAG="500") without changing our thinking (SILENCE TAG="1000") ~ Albert Einstein

1. Are the numeric values always either 250, 500 or 1000, or can there be other values?
2. I'm seeing several different formats of the info inside the parens (see below), are these true variations, or do they all fit a single template, and if so what is that?
   
   • (SILENCE TAG="500")
   • (SILENCE TAG"250")
   • (SILENCE MSEC="1000")

1. The numeric values are always either 250, 500 or 1000
2. That was why I made the :first :small :medium :large processes.
3. The files are 1k each the largest file has 28 TAGS

@PowerShell.exe -Command "Invoke-Expression -Command ((Get-Content -Path '%~f0' | Select-Object -Skip 2) -join [environment]::NewLine)"
@exit /b %Errorlevel%

$SourceDir = 'C:\Temp'
$Filter = '*.txt'
$Recurse = $false
$MaxMatches = 30

$dtProvider = New-Object -TypeName System.Globalization.CultureInfo -ArgumentList 'en-US'
Get-ChildItem -Path $SourceDir -Filter $Filter -File -Recurse:$Recurse | Where-Object {$_.BaseName -notmatch '-silence$'} | ForEach-Object {
	Write-Host "Processing $($_.Name)"
	$inFile = $_.FullName
	$outFile = "$($_.DirectoryName)\$($_.BaseName)-silence$($_.Extension)"
	$content = Get-Content -LiteralPath $_.FullName -Raw
	$results = [regex]::Matches($content, '\<SILENCE\s+MSEC\s*=\s*"(?<Silence>\d+)"')
	If ($results.Count -eq 0) {
		Write-Warning "Found no 'SILENCE' tags in '$($_.FullName)'!"
	} Else {
		$oldRemains = $newRemains = 0
		$i = 0
		$(ForEach ($result in $results) {
			$i += 1
			$silence = [int]$result.Groups['Silence'].Value
			If ($silence -eq 1000) {
				$newRemains = $silence
			} Else {
				$newRemains = [int]($silence / 2)
			}
			$out = (($oldRemains + $newRemains) / 1000).ToString('N3', $dtProvider)
			Write-Host "    Tag $($i.ToString().PadLeft(2)): $($silence.ToString().PadLeft(5)); out: $($out)"
			$out | Write-Output 
			If ($silence -eq 1000) {
				$oldRemains = 0
			} Else {
				$oldRemains = $newRemains
			}
			If ($i -ge $MaxMatches) {
				If ($i -lt $results.Count) {
					Write-Warning "Stopped processing '$($inFile)' after $($MaxMatches) of $($results.Count) tags!"
				}
				Break
			}
		}) | Set-Content -Path $outFile
	}
}

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