(
	// using GUI items to turn on and off a process
	var e, w, box1, box2, box3, ping, freqSlider1, freqSlider2, indexSlider, test1;
	
	w = GUIWindow.new("panel", Rect.newBy( 209, 69, 210, 251 ));
	box1 = CheckBoxView.new( w, Rect.newBy( 48, 53, 116, 27 ), "Play", 0, 0, 1, 0, 'linear');
	box2 = CheckBoxView.new( w, Rect.newBy( 49, 89, 114, 32 ), "Stop", 1, 0, 1, 0, 'linear');
	box3 = CheckBoxView.new( w, Rect.newBy( 46, 10, 116, 27 ), "Pause", 0, 0, 1, 0, 'linear');	

	freqSlider1 = SliderView.new( w, Rect.newBy( 49, 127, 103, 23 ), "SliderView", 0, 60, 400, 1, 'linear')
		.knobColor_(rgb(250,7,0));	
	freqSlider2 = SliderView.new( w, Rect.newBy( 49, 154, 103, 23 ), "SliderView", 0, 60, 400, 1, 'linear')
		.knobColor_(rgb(24,103,176));
	indexSlider = 	SliderView.new( w, Rect.newBy( 47, 188, 103, 23 ), "SliderView", 0, 0.1, 1, 0.01, 'linear')
		.knobColor_(rgb(13,122,29));
	
	box1.action = { 
				if(box1.value == 1,
				{box2.value = 0; box3.value = 0;}
				);			
	};
	
	box2.action = { 
				if(box2.value == 1,
				{box1.value = 0; box3.value = 0;}
				);	
	};	

	box3.action = { 
				if(box3.value == 1,
				{box1.value = 0; box2.value = 0;}
				);	
	};	

					
	Synth.play({
     var cont;
     cont = ControlIn.kr(freqSlider2)*SinOsc.ar(ControlIn.kr(freqSlider1), 0,ControlIn.kr(indexSlider));
     
	SinOsc.ar(cont,0, 0.9*ControlIn.kr(box1));	

	}
	);
	w.close;
)