\\ a simple way to do FM, using the mul and add of the modulator to
\\ control the range of the carrier, not adding to it...
\\ lp


(	
	{
	
	 s = SinOsc.ar(SinOsc.kr(0.4, 0, 200, 300), 0.3, 0.9);			
	 s
	 }.play
)