A condenser microphone includes a housing formed by combining: a top face member as a top face; a bottom face member as a bottom face; and intermediate members disposed between the top face member and the bottom face member. The scenario tree generated describes a recursive decision process, with flexible decision time points, which stably approximates the underlying stochastic processes. The method further comprises forming a recess in a source region of the substrate, where the recess has a sidewall, a bottom, and a depth, and where the sidewall of the recess is situated adjacent to a source of the floating gate memory cell. 5\u2266H1\u226670\u2003\u2003Equation 0.