...between the end of the first section and the start of the Trio, but have stumped myself in properly coding it (I went to alternative endings to ensure that I had a repeat sign)
(PDF and .ly file attached, beside the snippet below)
\version "2.20.00"
\repeat volta 2 {
d2 d8 c d e | f4 f8. e16 d2 | e2 e8 d e f | g4 g8. f16 e2 |
a4 a8. g16 f8. g16 a8. f16 | g4 g8. f16 e8. f16 g8. e16 |
g4 a8. g16 f8. f16 e8. e16 | d4 g8. g16 g4 r8 g, |
c4. g8 c4 d | e4. c8 e4 f | g e f d |}
\alternative {
{c c8. c16 c4 r }
{c c8. c16 c4\mark "Fine" r \bar "|." }
}
\break
\repeat volta 2 {
\bar ".|:"\mark "Trio" a4.\p r16 e a8. e16 gs8. e16 | a4. r16 e a8. e16 gs8. e16 |
a4 c b e | d8. c16 b8. c16 b2 |
a4. r16 e a8. e16 gs8. e16 | a4. r16 e a8. e16 gs8. e16 |
a4 c b e | a,4 a8. a16 a4 r |
}