(define mul-add
  (lambda (s m a) 
    (make-rsce-ugen "MulAdd" 0 (list s m a) #f 1 nil-id)))

(define comb-n
  (lambda (i t dl dc) 
    (make-rsce-ugen "CombN" 0 (list i t dl dc) #f 1 nil-id)))