An apparatus assembly for forming a compound dessert in a predetermined compound ring shape including a first outer ring shaped pan defining a cavity, the cavity having a dome shaped cross section with a closed circular end, an open end and a centrally positioned funnel shaped support having an upper solid planar surface. At least one SAW resonator is electrically coupled between said first and second ends of the rotor ring in series therewith, neither of said ends of said stator ring being directly connected to ground. The rigid transversal element of the connecting part or of the base part is introducible into the transversal passage of the base part or of the connecting part and vice-versa in such a way that the rigid transversal elements are pivotable in the passages. These affinity pairs are formed from ligand and ligand binding moieties that bind to nucleic acid molecules. The gain of the AGC amplifier is controlled based on the AGC signal. The second permittivity can be different than the first permittivity andor the second permeability can be different than the first permeability.