Hi all, Thanks for the comments. Yes - I am certain that I'm pressing the correct keys. I also got this reply from Akai:

"Also, if you have it transposed down a half step, then the
pitch bend can cause the A when you intend a C. You can spread the pitch bend plates apart by using a small Phillips screwdriver to loosen the screw."

I'm going to have a fiddle around with that - as I don't fully understand yet what that does, but any other thoughts as to why I get the wrong notes when I press the right buttons - gratefully received!
Susan