method _mod = self#prim2 (fun t -> (self#at t)#_mod)
method larger = self#prim2 (fun t -> (self#at t)#larger)
method smaller = self#prim2 (fun t -> (self#at t)#smaller)
+ method max = self#prim2 (fun t -> (self#at t)#max)
+ method min = self#prim2 (fun t -> (self#at t)#min)
method delay : signal_type -> signal_type =
fun (s : signal_type) ->