Please Help about sound system

void testact()
{
	vec_scale(my.scale_x, 1);
	my.skill21 = random(100);

	while(1)
	{
		set(my, INVISIBLE);
		if(AckR_getMarker(my.skill95, my.x, my.pan, FALSE) == 0)
		{
			// my.pan=(my.pan+time_step*2+random(1))%360;
			reset(my, INVISIBLE);
		}
		
		my.skill21 += time_step*10;
		my.skill21 = cycle(my.skill21, 0, 100);
		ent_animate(my, "walk", my.skill21, ANM_CYCLE);
		
		wait(1);
	}
}