For if the trumpet give an uncertain sound. — Not only has each instrument its own sound, but in each instrument there is a distinction of notes. If a trumpet does not clearly sound the advance when it is intended, or the retreat when it is meant, the trumpet is useless, the soldiers not knowing what to do.
Related Commentaries of 1 Corinthians 14:8
1 Corinthians 14:8
8 For if the trumpet give an uncertain sound, who shall prepare himself to the battle?