Hi Mike, It's encouraging to hear from another player, that has come to the same conclusion as I have. I bought a Tyros a couple of month ago but retained my KN7000. As you say, some of the Tyros sounds and styles are very good but I just cannot come to terms with the unfriendly operating system. I think it will be on the market very soon
There was a comment on this Forum, some time ago, that a player would "Rather admit to marrying the wrong person, than admit that they bought the wrong Keyboard"....... Well, here's one guy who is quite willing to confess that the Tyros was a mistake

The Technote convert disc which Marilyn mentioned, cost about £50 - if I remember correctly - I wish you luck trying to find it on their website

As far as a sound system for home use is concerned, I use a Technics 'Hi-Fi' system and a couple of good speaker cabinets (Leak Sandwich). I would suggest that almost any of the well known, currently available 'Hi-Fi' setups, around the £150 - £200 would be adequate. Make sure that the system has 'Line In' facilities
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Willum