))
	     ((= k n))
	   (set! mod1 (+ mod1 (oscil (mods1 k))))
	   (set! mod2 (+ mod2 (oscil (mods2 k)))))
	 (outa i (/ mod1 n))
	 (outb i (oscil car1 (/ mod1 (* n n))))
	 (outc i (/ mod2 n))
	 (outd i (oscil car2 (/ mod2 (* n n))))
	 ))))

(set! (selected-graph-color) (make-color 1 1 1))
(set! (selected-data-color) (make-color 0 0 0))
-->



<div class="greenish">cascade FM: sin(sin(sin))</div>

<p>We can, of course, use FM (or anything) to produce the modulating signal.  When FM is used, it is 
sometimes c