I am not sure we are all talking about the same noise "artifact". What I heard was not a "Ground Loop Hum". These tend to be more constant and persistent and able to be filtered as Charlie indicated. What I believe I heard was a recorded sound present during playback of a RD track. It was a sudden onset load noise that came and went at the very end of the track. Some one indicated that in their case, they examined the actual drum RT wav and it was fine. So the thought was this was being generated during the re-generation process.

Will just have to see what comes of this.

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