a confidence level between 60 and 75 fig1 shows a statistical analysis for shifting without compensation for manufacturing differences and compares it with a statistical analysis for shifting that does have manufacturing compensation each entry in the table represents 25 shifts columns are as defined in the discussion of fig8 11 above the entries in the table are shift times the standard deviation without compensation is 0 93 while the standard deviation with compensation is 0 66 the maximum shift time if the population is normal three standard deviations without compensation is 14 6 the maximum shift time with compensation if the population is normal is 13 3 thus the manufacturing compensation is shown to reduce the standard deviation by 29 and to reduce the maximum shift time under certain assumptions by 9 this is a significant improvement in fig1 a simplified block diagram illustrates the functions of a software program in which the final setting of the matrix pointer from a previous operation of the apparatus is stored in a memory and utilized as the starting position of the pointer upon the next startup the final gain values from the previous operation of the equipment are loaded into a previous final setting register 191 when a selector 193 has selected the mode of operation in which the previous final setting is utilized to initialize the pointer a median setting register 195 is not utilized the pointer register 197 is loaded upon startup by the contents of the previous final setting register 191 the pointer register 197 then.