A hearing aid that stores preset signal processing parameters, and performs stepwise adjustment of one or more of the stored signal processing parameters from a starting point of a predetermined range to an end point of the range is provided. In a first aspect, an improved method of continuously measuring pressure from a compressible vessel is disclosed, wherein a substantially optimal level of compression for the vessel is achieved and maintained using dynamically applied dither perturbations on the various axes associated with the vessel. Each build-up layer contributes an amount of concavity to the integrated electronic panel assembly. The method separates the heavy products from the alkanones to reduce a level of the aldehyde-based impurities.