\version "2.4.3"
\paper {indent = 0\in}
%{

In the User Guide, Section 5.7.13 Dynamics gives a misleading example
	\setTextCresc
	c \< d e f\!
	\setHairpinCresc
	e\> d c b\!
The \setHairpinCresc is not necessary because the \setTextCresc is only good once.  Entering \setHairpinCresc does cancel \setTextCresc.

\setTextCresc has no effect for a decrescendo. Use both
	\set decrescendoText    = "Decrescendo "
	\set decrescendoSpanner = #'dashed-line
And these are only good once.

To change crescendo use both
	\set crescendoText      = "Crescendo "
	\set crescendoSpanner   = #'dashed-line
Do not use \setTextCresc, it overrides.

Document allows line, dashed-line, dotted-line, and hairpin.
hairpin overrides text
line gives dashed-line

No way found to change markup font, within \markup or with \override.

\markup is not necessary.  Just use "xxx".

%}
\score { \relative c'' {
							% Bar 1
c2\< d e f\!
c2\< d e f\!
e2\> d c b\!
c2\< d e f\!
	\break
							% Bar 9
\setTextCresc	% effects only first following crescendo
c2\< d e f\!
c2\< d e f\!
\setTextCresc	% no effect on following decrescendo
e2\> d c b\!
c2\< d e f\!
	\break
							% Bar 17
\set crescendoText      = "Crescendo "
\set crescendoSpanner   = #'line
c2\< d e f\!
\setTextCresc
c2\< d e f\!
\set decrescendoText    = "Decrescendo "
\set decrescendoSpanner = #'dashed-line
e2\> d c b\!
c2\< d e f\!
	\break
\override TextScript         #'font-size = # 6
\override Script             #'font-size = # 6
\override DynamicText        #'font-size = # 6
\override TextSpanner        #'font-size = # 6
\override DynamicLineSpanner #'font-size = # 6
							% Bar 25
c2\< d e f\!
c2\< d e f\!
\setTextCresc
e2\> d c b\!
c2\< d e f\!
	\break
							% Bar 33
\set crescendoText      = \markup { "CRESC " }
\set crescendoSpanner   = #'line
\set decrescendoText    = \markup { "DeCRESC " }
\set decrescendoSpanner = #'dotted-line
c2\< d e f\!
c2\< d e f\!
\setTextCresc
e2\> d c b\!
\setTextCresc
c2\< d e f\!
	\break
							% Bar 41
\set crescendoText      = \markup { "Cresc " }
\set crescendoSpanner   = #'hairpin
c2\< d e f\!
c2\< d e f\!
\set decrescendoText    = \markup { "DeCresc " }
\set decrescendoSpanner = #'line
e2\> d c b\!
\setTextCresc
c2\< d e f\!
	\break
}}