This is my first posting. I hope I searched this forum and the web carefully enough, but I didn't find an answer after well ahem hours.
Writing accordeon music with abcm2ps under linux, I'd like to write the fingering of the bass line as well. I know that fingering is inserted with !number!, e.g.
!4!C !3!G !2!D !5!F
But how do I write the fingering of the second bass row? In printed sheet music the number of the finger is underlined so that this is clear, e.g.
!4!C !2!D !_4!E !5!F !3!G !_5!A !_3! B !4!C
Thanks in advance,