This is between you and him for PK, but I think I know why because AMDK likes to talk very loud, so the mic peaks easily.
But on a serious note, he is right that lowering the recording volume doesn't significantly lower the gain. That explains why the entire waveform is peaking or easily peaking, even though it's relatively acceptable and does not entirely distort the sound.
The small area or even the entire waveform proves that something is wrong with the Carnyx, and the only reason that this could happen is if it is peaking due to the above flaw. Of course, it isn't going to sound as bad as a $20 microphone, but at $300, it should do better.
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Lowering the recording volume or dial on the Carnyx only affects the mic output volume because the audio clipping is everywhere. Regardless of how the recording value is set, it doesn't get much better, which is a fundamentally flawed design. The gain is probably ALWAYS sitting at around 80-100% internally.
Overall, the Carnyx is audible enough and acceptable for regular use. If you give it to me for free, I'll be okay with using it because I'm not that picky although ill probably not buy it because for $300 i think there are better USB mics out there with better quality and software.