float f_1336 = 1336.0/48000.0;
    	float f_697 = 697.0/48000.0;
    	float f_770 = 770.0/48000.0;
    	float f_852 = 852.0/48000.0;
    	float f_941 = 941.0/48000.0;


        for (i=0; i<48000; i++)
        {
        	float sample_base = amp*sin(2*PI*f_1336*i);
            if (i < one_fourth){
            	 sample = amp*sin(2*PI*f_697*i);
            	 tone = sample_base + sample;

            }
            if (one_fourth < i < 2*one_fourth){
            	 sample = amp*sin(2*PI*f_770*i);
            	 tone = sample_base + sample;
            }
            if (2*one_fourth < i < 3*one_fourth){
            	 sample = amp*sin(2*PI*f_852*i);
            	 tone = sample_base + sample;
            }
            if (3*one_fourth < i < 4*one_fourth){
            	 sample = amp*sin(2*PI*f_941*i);
            	 tone = sample_base + sample;
            }