Phool verb to psychologically fool There is no accurate computer model which completely describes the way a trumpet behaves. Until there is one, all theories and subsequent proofs are little more than snake oil. If something works, then it works. Too often it has been up to marketing departments to phool the poor insecure trumpet player into thinking there is a solid scientific basis for this or that modification. Up The Empire! Or should I say Long Live Empirical Findings.