I've posted before that I've never had a problem adjusting to any size of keys (be they full size, Yamaha slightly shrunk, or Casio CZ101 mini) but I've never really analysed how I did it.

This was noticed some years back by a music-teacher relative who commented that I never look at the keys. This may not be totally true but certainly its impossible to sing and look, so I play a fair amount blind. In fact if there are big distractions / idiots on the dance floor I even close my eyes for a while!

So my thanks are due to Scott, who has nailed the reason. I am indeed a black key feeler. I've never noticed it before but thats exactly whats happening.

You learn something every day....