( ( Loud sounds ) ( ( ( ( ( ( are not ) amplified ) , ) and ) ( are ( heard ( as ( though ( there ( were ( no ( hearing instrument ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Loud) (NNS sounds)) (VP (VP (VBP are) (RB not) (VP (VBN amplified))) (, ,) (CC and) (VP (VBP are) (VP (VBN heard) (SBAR (RB as) (IN though) (S (NP (EX there)) (VP (VBD were) (NP (DT no) (NN hearing) (NN instrument)))))))) (. .)))
Loud sounds are not amplified, and are heard as though there were no hearing instrument.
(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)))))))) (. .)))