Potential answers for "Machine's low-pitched noise"

⭐⭐⭐⭐ BLOOP
⭐⭐⭐ BASSOON
⭐⭐⭐ BASS
⭐⭐⭐ DEEP
⭐⭐⭐ FLAT
⭐⭐⭐ BASSTUBA
⭐⭐⭐ CHIHUAHUA
⭐⭐⭐ CELLOS

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