A music stand extension panel for placement onto a music stand, comprising a main support plate having a width of at least approximately 35 inches, and a support ledge, wherein the main support plate and support ledge form a rigid construction. The heat-transferring device includes one or more flexible thermally conductive members, one end of each being thermally coupled to the heat generating device and the other end of each being thermally coupled to the heat sink. Two kinds of 3D logic cells are disclosed. Predefined sets of templates may be used to check the messages, each set of templates being associated with respective originating point codes andor calling party addresses. The conical shape allows the solids to slide into an annulus.