Gene,
On occasion, I've checked the KAB strobe against two different 1000Hz tones generated by oher test records and checked on no less than three different frequency counters. From what I've checked using practical application, it's pretty accurate. This was part of the same test I did with the speed checks for the Feickert Adjust+ software.
I'm with you on being able to verify results by testing against other measures. The set of tests above gave me confidence in the results. Although the tests also showed me the topic I raised in the thread to you about CPU/resource bandwidth. That same test was checked with other FFT based frequency counter software I had access to at the time.
Dre