@ This file illustrates how to generate repeat marks with "wings" above and 
@ below. 

breakbarlines 1
bracket
brace 2-3

*define leftwingtop "\mf\\176\"/bar/b0
*define leftwingbot "\mf\\177\"/bar/b0
*define rightwingtop "\mf\\177\"/a0/rot180/r2
*define rightwingbot "\mf\\176\"/a0/rot180/r2

[staff 1 treble 1]
G B | (: &leftwingtop &leftwingbot C' C | G B :) &rightwingtop &rightwingbot | (: &leftwingtop &leftwingbot C' C | G B :) &rightwingtop &rightwingbot | C'+ |
[endstaff]

[staff 2 treble 1]
R! | (: &leftwingtop R! | R! :) &rightwingtop | (: &leftwingtop R! | R! :) &rightwingtop | R! |
[endstaff]

[staff 3 bass 1]
R! | (: &leftwingbot R! | R! :) &rightwingbot | (: &leftwingbot R! | R! :) &rightwingbot | R! |
[endstaff]