I actually bought a 'clocky'.It's alarm tone was tonally unpleasant.I bought a bottle of 'brilliant pebbles',set the bottle beside the clock,and was amazed at the improvement in tone.However,still thinking something was missing,I mailed it off to the NASA 'cryo' lab and had it treated.Now I am simply astonished at the beauty of the richness of tone the thing produces.It seems to jump and roll somewhat more smoothly than before the 'treatment',also.