DTT swept sine issue on x2ats
Found in at least 2 cases, running a swept sine test, DTT produced negative X axis values eg running a swept sine from 0 to 32KHz, the X axis values produced were 0 to -32KHz. One example of this is loading and running advligorts/test/rcgtest/perl/decfilters/Template_Dec_Filters.xml. On running this test, the result plots don't show any data unless I change the X range to linear, -32000 to 32000. Then I see the transfer function data on the negative side of zero.