Okay, the user wants me to translate "sound substitution" into Finnish. Let me check the rules again. The first rule says to translate all content into Finnish. The second rule states that if the content is already in Finnish, leave it as is. The third rule is to provide only the translation without any explanations.
So, the input here is "sound substitution." I need to make sure this isn't already in Finnish. "Sound" in Finnish is "ääni," and "substitution" would be "korvaus." So "sound substitution" would be "äänen korvaus." Let me confirm that. "Äänen" is the genitive form of "ääni," meaning "of the sound," and "korvaus" is substitution. So "äänen korvaus" translates to "sound substitution."
I should check if there's a more common term in Finnish for this. Maybe "äänenkorvaus" as a compound word? But I think "äänen korvaus" is correct. Since the user wants only the translation, I'll provide that without any extra text. No explanations, just the Finnish translation.
äänen korvaus
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