param(
    [Parameter(Mandatory = $true)]
    [string]$TextPath,

    [Parameter(Mandatory = $true)]
    [string]$OutputPath,

    [int]$Rate = 0
)

$ErrorActionPreference = "Stop"

Add-Type -AssemblyName System.Speech

$text = Get-Content -LiteralPath $TextPath -Raw
$synth = New-Object System.Speech.Synthesis.SpeechSynthesizer
try {
    $synth.Rate = $Rate
    $synth.SetOutputToWaveFile($OutputPath)
    $synth.Speak($text)
}
finally {
    $synth.Dispose()
}