Thanks to All of you for the help J
Now I am into the cosmetic stuff (= just about done) . With a sample rate of ~90KHz the FFT frequency axis starts at 0 and goes to ~45KHz. I have a band pass filter from 35KHz to 55KHz. Does anyone know how to make the frequency axis start at say 25KHz to 60KHz ? Still a 45KHz spread, just off set by 25KHz so that 40KHz is roughly centered . It doesn't REALLY matter, it just look better J Thanks
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