Just see daftcombo's iZotope analyses of the example files I posted. They look like the same in FFT view, but the waveform peak values are vastly different, and therefore the methodology of look at individual FFT bins for peak level alignment is flawed:
https://www.audiosciencereview.com/...indows-audio-quality-debate.19438/post-890577
Nope, we are still not talking about the same thing.
I was trying some tests using dual sinewave to find out about IMD of my amplifier, instead I encountered distortion up to -60dBFS, which later proven to be audible.
Previously i confirmed that no matter what you do in EQ APO, if you set sinewave volume to -0,12dB or more, CAudio Limiter will trigger and no higher volume setting is possible. Instead the amplitude will be normalized and thus distorted, compared to the original.
This is visible on FFT graph as a peak which will not rise when volume is increased in EQ APO, only if you increase the signal on the amplifier. Its also visible on oscilloscope as the amplitude will not rise beyond certain threshold.
The difference is, that frequency and phase for two signals is in my case fixed by the software i use. Thats why i said i dont have tools to test more than two signals at the time. I am not using a file, but a tone generator.
So to filter out the distortion caused by CAudioLimiter I had simply to understand that I am mixing two signals, and therefore the threshold for triggering Limiter is 6dBFS lower than I originally expected it to be. Once I sorted that out, distortion was gone - I just needed to understand why it was triggered once again.
So sorry to say, but your posts are in no relation to what I was doing and reading from FFT graph.