int x;
void main()
{
	while(1)
	{
		printf("Press START\n");
		while(!start_button())
		{}
		while(stop_button()==0)
		{
			x=knob();
			printf("knob is at %d\n", x);
			if(x<128)
				{
				tone(250.,.1);
				}
			else
				{
				tone(550.,.1);
				}
		}
	}
}