An object of the present invention to provide an apparatus for processing a substrate through successive steps including spin-drying the substrate with a single processing facility while preventing the substrate from being contaminated by a substrate processing liquid, etc. In a second aspect, the present invention relates to a preferred pellet-layering process for preparing such compositions. Each of the one or more command selectors has associated code for selecting a function available from the plurality of portions of the server component. Optionally also information on packet is provided. Methods and apparatus are provided which use pre-set digital gains or digital gain adjustments to compensate for the non-linearities as a function of total transmit power such that at the output, the desired relative powers are observed. Further, one or more match criteria can be received from a user and utilized to determine, for the portion of the corresponding channel, that the first audio signal is substantially identical to the second audio signal if the identified degree of difference is within the received match criteria.