A music teaching aid may incorporate a pinball-like game. The apparatus provides a membrane module including a substrate, a catalytic layer and a membrane layer. The outside portion is shaped to provide a pair of laterally spaced-apart sealing lips that have a pressure-activated sealing geometry for tight sealing against the panels when under pressurization. In other embodiments a crude composition of a cyclic ester of an organic ester can be purified using azeotropic distillation. The message identifies the addressee of the email message and includes instructions for indicating arrival of the message at the addressee. In the carrier tape package 20, a data storage unit 23, in which an IC tag 25 having carrier tape information containing identification information of electronic components P held in the carrier tape 22 is held in a holder 24, is attached to the tape reel 21.