The .NET speech engine accepts more than just plain text. If you use SpeakSsml() instead of Speak(), you can use XML to switch languages, speak rate, and other parameters within a text.

The following example requires both an English and a German voice installed. If you don’t have a German voice installed, change the language ID in the script appropriately. Here is how you find out the language IDs available on your system:

 
PS C:\> Add-Type -AssemblyName System.Speech 

PS C:\> $speak.GetInstalledVoices() | Select-Object -ExpandProperty VoiceInfo | Select-Object -ExpandProperty Culture | Sort-Object -Unique

LCID             Name             DisplayName                                                                                         
----             ----             -----------                                                                                         
1031             de-DE            German (Germany)                                                                                    
1033             en-US            English (United States)
 

And here is the full example:

#requires -Version 2.0
Add-Type -AssemblyName System.Speech
$speak = New-Object System.Speech.Synthesis.SpeechSynthesizer
$ssml = '
<speak version="1.0" xmlns="http://www.w3.org/2001/10/synthesis" 
    xml:lang="en-US">
    <voice xml:lang="en-US">
    <prosody rate="1">
        <p>I can speak English!</p>
    </prosody>
    </voice>
    <voice xml:lang="de-DE">
    <prosody rate="1">
        <p>und ich kann auch deutsch sprechen!</p>
    </prosody>
    </voice>
    <voice xml:lang="en-US">
    <prosody rate="0">
        <p>...and sometimes I get really tired.</p>
    </prosody>
    </voice>
</speak>
'

$speak.SpeakSsml($ssml)

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