Fatḥah, kasrah, and ḍammah are short vowels. Unnecessarily extending them can create an unintended elongation sound. Conversely, an actual madd letter must receive its proper duration.
Compare short بَ — بِ — بُ with extended بَا — بِي — بُو. Hear the difference without distorting the consonant.
Sukūn signifies the absence of a vowel; do not append a made-up short vowel to a sākin consonant. Qalqalah is not an added vowel either.
The particular imālah of مَجْرَاهَا is a transmitted case, not permission to bend every fatḥah or alif.
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Short vowels, sukūn, and unwanted extension
Comprehensive Revision — Applying Tajwīd Rules
Fatḥah, kasrah, and ḍammah are short vowels. Unnecessarily extending them can create an unintended elongation sound. Conversely, an actual madd letter must receive its proper duration.
Compare short بَ — بِ — بُ with extended بَا — بِي — بُو. Hear the difference without distorting the consonant.
Sukūn signifies the absence of a vowel; do not append a made-up short vowel to a sākin consonant. Qalqalah is not an added vowel either.
The particular imālah of مَجْرَاهَا is a transmitted case, not permission to bend every fatḥah or alif.