Punch paste, delete, and fade is sometimes creating a new noise that sounds like a blip of technical interference

It doesn’t always have this problem, but i can’t figure out how to avoid it. It shows up as a blur in the spectrogram. This is a picture after fading in on a plosive.

You have infrasound …

Although that’s inaudible it can cause audible effects when you edit/process the waveform.
Solution: apply a high-pass filter @ ~100Hz, (aka rumble filter),
to remove infrasound before doing any other editing.

BTW if you want less temporal blur on the spectrogram, reduce the window size from 1024 to say 64 …

spectrogram window size

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