overover, my apologies, I should have been more specific...When I wish to play with headphones, I select Function>>>Utility>>>Config 2 >>>Speaker to Off..This is what I have always done, without problems until now..Sincerely hope this helps.
Aldus...On my Tyros 4, after I select Function, Utility, Config 2 I have 3 options under Speaker..Headphones..On..Off. As I said earlier, I select off. Hope this helps.
Fredo.