Combined Filters ATrax Front Sums The ATrax Front Sums (ATX-FS) 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 Front Sums filter is a so called "math filter". Math filters are created through calculations. You get the sum of a number by adding up the digits within that number. The is the first digit of that sum. If the sum is only one digit the Front Sums filter returns 0. To show you how to calculate the ATrax Front Sums filter select one of the links below for a step by step example.
ATrax Front Sums
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