Gary,
Yep, I noticed the hum too....overlooked it as the sound of the Tyros Twin was my focus.

BUT I still think the T3 sounded pretty darn good Don't know of any Synth he could have used to do any better.

Not bad at all for, as you say, us old codgers (I'm 62). But my kids and grandkids would hate it.

Did you listen to his solos? Not perfect but sounds were good and he is decent player.

Lee S.