Combined Filters ATrax Alt Sums The ATrax Alt Sums (ATX-AS) is a so called "combined filter", a combination of two filters:
ATrax (ATX), for Alternate or Alternative Tracking, has to be seen an improvement of the VTracs (VTX), as it combines digits logically rather than by a simple adding of 5 to the digit. Since the conversions do not have to be done by hand any longer, other combinations can be done with simple tools online rather than with pencil and paper. The Alt Sums filter is a so called "math filter". Math filters are created through calculations. In this case starting with the highest digit of the number the digits are alternately subtracted and added to create the Alt Sums between 0 and 9. To show you how to calculate the ATrax Alt Sums filter select one of the links below for a step by step example.
ATrax Alt Sums
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