PowerShell: splitting an input file and saving to wav format in chunks

streOn 4 out of 5 days, I have a car journey that is between 0.75 and 1.25 hours. I want to be able to take a free (e.g. Project Gutenberg) book, or at least a DRM free book, split it into sections, and create an audio file from each section.
Let’s say that the following is my entirety of my book:

Guten01

I want to read/hear in sections: lines 1 and 2 (section 1), lines 3 and 4 (section 2), lines 5 and 6 (section 3), line 7 (section 4), giving this:

Guten02

This PowerShell is one way to do that (Although I write the split text back out to disk and then read it back in, that step could be removed).

Guten03

function Get-FileName($extension = "txt") {
 "{0}{1}_{2}.{3}" -f ($outputRootDir, $outputFileNamePrefix, $chunk, $extension)
}
function Write-WavFile() {
 $speech = New-Object -TypeName System.Speech.Synthesis.SpeechSynthesizer
 $speech.SelectVoice("Microsoft Hazel Desktop")
 $textToSpeak = Get-Content -Path $(Get-FileName) -Encoding UTF8
 $speech.SetOutputToWaveFile($(Get-FileName "wav"))
 $speech.Speak($textToSpeak)
 $speech.Dispose()
 $speech = $null
}
function Split-File (
 $fileToSplit = 'C:\Temp\pandp.txt',
 $splitMarker = "SPLITHERE",
 $outputFileNamePrefix = "TheseLinesAudio",
 $outputRootDir = "c:\temp\"
) {
 Add-Type -AssemblyName System.Speech
 $reader = New-Object -TypeName System.IO.StreamReader($fileToSplit)
 $chunk = 1
 $speech = New-Object -TypeName System.Speech.Synthesis.SpeechSynthesizer
 $speech.SelectVoice("Microsoft Hazel Desktop")
 while (($line = $reader.ReadLine()) -ne $null) {
 if ($line -match $splitMarker) {
 Write-WavFile
 $chunk++
 } else {
 Add-Content -Path $(Get-FileName "txt") -Value $line -Encoding utf8
 }
 }
 Write-WavFile
 $reader.Close()
 $reader.Dispose()
 $reader = $null
}
#entry point...
Split-File
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