Thanks BrianQ. That's pretty much what I had theorized, but I really don't want to let the magic smoke out, so, I tend to ask obvious questions. I found a long time ago, with me anyway, that being presumptuous in anything can be costly. (grinning)
I really appreciate it.
That’s why it’s good to stay with “branded” wall warts, they’re actually made for musical applications? Those “general purpose” wall warts aren’t known to have high/low frequency noise filters.
Thank you Paul, BrianQ. Looks like I'll be checking the music shops online and off.