Quote I use PD 15 and I am seeing strange waveform artifacts both on my camera audio and on external audio recording. It looks like audio noise but there is no audible noise to be heard when I view in Audacity even when amplified 12db
I have attached a screen shot.

Sorry I should have said that the attached waveform was done using a digital recorder at 20% gain setting with no mics connected. i do not see these artifacts on any of my audio files when opened in Audacity or other programs. Is this a PD bug?

It looks like you've expanded the vertical scale to the max, and I believe the "noisy" waveform is how PD indicates that audio is actually present, even though there isn't anything like the signal amplitude that the waveform implies.

On tracks with a truly silent audio track (no recorded audio), there's a thicker solid line. This is from PD14:



PD15 isn't going to get any patches at this point, but if you'd like to share one of the clips other people can check to see if there's anything unusual about them.