You're absolutely right Ralf.
AFAIC I'd do :
\version "2.19.15"
\relative c' {
f4 f f f |
f4 f f f |
f4 f f f |
f4 f f f |
f4
-\tweak TextSpanner.bound-details.left.text #"rit. "
-\tweak TextSpanner.bound-details.left-broken.text ##f
-\tweak TextSpanner.bound-details.right-broken.text ##f
-\tweak TextSpanner.bound-details.right.text #" a Tempo"
\startTextSpan f f f
f4\stopTextSpan f f f |
f4 f f f |
f4 f f f |
f4 f f f |
f4 f f f |
f4 f f f |
}In my previous proposition I tried to stick to Werner's parameters.
Cheers,