while dutifully pulling on heartstrings , directors dean deblois and chris sanders valiantly keep punching up the mix . 
(ROOT (S (PP (IN while) (S (ADVP (RB dutifully)) (VP (VBG pulling) (PP (IN on) (NP (NNS heartstrings)))))) (, ,) (NP (NNS directors) (NML (NML (NN dean) (NNS deblois)) (CC and) (NML (NNP chris) (NNS sanders)))) (ADVP (RB valiantly)) (VP (VBP keep) (S (VP (VBG punching) (PRT (RP up)) (NP (DT the) (NN mix))))) (. .)))
(ROOT (S (PP (IN ) (S (ADVP (RB )) (VP (VBG ) (PP (IN ) (NP (NNS )))))) (, ) (NP (NNS ) (NML (NML (NN ) (NNS )) (CC ) (NML (NNP ) (NNS )))) (ADVP (RB )) (VP (VBP ) (S (VP (VBG ) (PRT (RP )) (NP (DT ) (NN ))))) (. )))