Try moving the throat as if you were humming "happy birthday" but not pushing the air with your lungs. Your throat will constrict for higher notes more. Or may

Try moving the throat as if you were humming "happy birthday" but not pushing the air with your lungs. Your throat will constrict for higher notes more. Or maybe just try humming, dunno. In the end you don't really need the step 2 - you can try +2,-2, +3, -3, +1, -1, ... it will only slow you down by by a factor of 2 and you will train yourself to recognize the differences eventually anyway.