(define (setgray g) (string-append (ly:number->string g) "g "))
(define (setlineparams) "1 j 1 J ")
-(define (beam width slope thick)
+(define (beam width slope thick blot)
(let ((ht (* slope width)))
(string-append (moveto 0 (- (/ thick 2)))
(rlineto width ht)