I have a track (voice) that “suddenly” became very low volume. I cannot reconstruct it. Knowingly I had used only the effects “Filter Curve”, “Compressor”, “Amplify?” (German “Verstärken”, increase volume), sometimes also “Normalize”.
After I marked the track and transferred it via CTRL C and CTRL V to new track, the volume was back to normal. (I discovered this solution by accident.) What could have been the cause?