لِصَوْتِ الْغُرَابِ — for the sound of the crow.
لِـ: preposition.
صَوْتِ: genitive noun with kasrah and the first term of an iḍāfah.
الْغُرَابِ: genitive second term with kasrah.
The ordinary noun صَوْت is nominative as صَوْتٌ in one construction and genitive as صَوْتِ here. The sound-word «غاق» is not being declined.
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Al-Aṣwāt — Sound-words, Their Two Uses and Grammatical Analysis
لِصَوْتِ الْغُرَابِ — for the sound of the crow.
لِـ: preposition.
صَوْتِ: genitive noun with kasrah and the first term of an iḍāfah.
الْغُرَابِ: genitive second term with kasrah.
The ordinary noun صَوْت is nominative as صَوْتٌ in one construction and genitive as صَوْتِ here. The sound-word «غاق» is not being declined.