Browsing the catalog, I find that the quality of the spoken audio varies greatly from text to text or even from chapter to chapter.
1	Browsing	browse	VERB	VBG	VerbForm=Ger	6	advcl	6:advcl	Discourse=context-circumstance:60->61:0
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	3:det	Entity=(7-abstract-giv:act-cf2-2-coref
3	catalog	catalog	NOUN	NN	Number=Sing	1	obj	1:obj	Entity=7)|SpaceAfter=No
4	,	,	PUNCT	,	_	1	punct	1:punct	_
5	I	I	PRON	PRP	Case=Nom|Number=Sing|Person=1|PronType=Prs	6	nsubj	6:nsubj	Discourse=attribution-positive:61->62:0|Entity=(77-person-giv:act-cf1*-1-ana)
6	find	find	VERB	VBP	Mood=Ind|Number=Sing|Person=1|Tense=Pres|VerbForm=Fin	0	root	0:root	_
7	that	that	SCONJ	IN	_	14	mark	14:mark	Discourse=context-background:62->65:1
8	the	the	DET	DT	Definite=Def|PronType=Art	9	det	9:det	Entity=(47-abstract-giv:inact-cf3-2-coref
9	quality	quality	NOUN	NN	Number=Sing	14	nsubj	14:nsubj	_
10	of	of	ADP	IN	_	13	case	13:case	_
11	the	the	DET	DT	Definite=Def|PronType=Art	13	det	13:det	Entity=(79-abstract-new-cf4-3-sgl
12	spoken	speak	VERB	VBN	Tense=Past|VerbForm=Part	13	amod	13:amod	_
13	audio	audio	NOUN	NN	Number=Sing	9	nmod	9:nmod:of	Entity=79)47)
14	varies	vary	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	ccomp	6:ccomp	_
15	greatly	greatly	ADV	RB	Degree=Pos	14	advmod	14:advmod	_
16	from	from	ADP	IN	_	17	case	17:case	_
17	text	text	NOUN	NN	Number=Sing	14	obl	14:obl:from	Entity=(80-abstract-new-cf5-1-sgl)
18	to	to	ADP	IN	_	19	case	19:case	_
19	text	text	NOUN	NN	Number=Sing	14	obl	14:obl:to	Entity=(81-abstract-new-cf6-1-sgl)
20	or	or	CCONJ	CC	_	23	cc	23:cc	_
21	even	even	ADV	RB	_	23	orphan	21.1:advmod	_
21.1	varies	vary	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	_	_	6:ccomp|14:conj:or	CopyOf=14
22	from	from	ADP	IN	_	23	case	23:case	_
23	chapter	chapter	NOUN	NN	Number=Sing	14	conj	21.1:obl:from	Entity=(82-abstract-new-cf7-1-sgl)
24	to	to	ADP	IN	_	25	case	25:case	_
25	chapter	chapter	NOUN	NN	Number=Sing	23	orphan	21.1:obl:to	Entity=(83-abstract-new-cf8-1-sgl)|SpaceAfter=No
26	.	.	PUNCT	.	_	6	punct	6:punct	_
