( ( ( ( ( ( Detects and ) regulates ) ( ( the level ) ( of ( ambient sounds ) ) ) ) -- ) ( ( ( ( Weak sounds ) ( are amplified ) ) and ) ( ( loud sounds ) ( are attenuated ) ) ) ) . )
(ROOT (S (S (VP (VBZ Detects) (CC and) (VBZ regulates) (NP (NP (DT the) (NN level)) (PP (IN of) (NP (JJ ambient) (NNS sounds)))))) (: --) (S (S (NP (NNP Weak) (NNS sounds)) (VP (VBP are) (VP (VBN amplified)))) (CC and) (S (NP (JJ loud) (NNS sounds)) (VP (VBP are) (VP (VBN attenuated))))) (. .)))
Detects and regulates the level of ambient sounds -- Weak sounds are amplified and loud sounds are attenuated.
(ROOT (S (S (VP (VBN Amplified))) (, ,) (NP (PRP it)) (VP (VBZ becomes) (SBAR (S (NP (NNP louder)) (VP (VBZ happens) (VP (VB do) (NP (DT the) (NN sound)) (PP (IN during) (NP (DT a) (NN resonance)))))))) (. .)))