Not sure if this is a fault as such but don’t understand why this is happening here.
Attached you should find a song, in it is a single sample. Played dry in the first pattern and then adding low pass and high pass filters to take out some unwanted frequencies. As you can see each of the filters is making the output substantially louder event though you can see it removing frequencies if you look at the spectrum. The phase meter also shows it to be in mono so it is not a case of it removing frequencies that were out of phase and thus the bits left over do sum to a higher signal. I have also tried the other filter models and all behave the same to varying extents.
Same seems to happen with many other samples in this pack!
Filters work by adding previous samples to the current one with some coefficients. This can affect the volume I guess… especially in bassy samples where individual points are close together…
That’s an effect caused by all filtering, especially low-pass. I can’t explain the exact physics behind this though. The volume (the RMS level) doesn’t increase, but the filtering alters the shape of the waveform which often results in bigger peaks. The steeper the filter curve is, the more noticeable this effect is.
Here’s a 300hz square wave in audacity with a steep 400hz low-pass filter on it.
