My legacy k4 has an intermittent "static like" pop that occurs ONLY in the whistle set. The rest of the sounds are clear and there is no other static of any kind. Its more common/noticable on the lower tones at slower speeds usually after the button has been released near the end of the tone. FWIW. I'm operating this loco with TMCC could this be some kind of glitch in the "backward compatability", should I test it with legacy and see if it still occurs. I've checked connections in the tender and done a reset with no improvement. As I said earlier its not a consistant problem so I hesitate sening it in for fear of a "no problem found" result.
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