Ian, Thanks for the speedy response.

To clarify my previous post;

The RTs are playing over the "numbered" chords, e.g. DMaj7, Gm6 etc. but dropping out on the "plain" chords, e.g. D, Gm etc.

I used the Roman numerals to indicate that on my test progression I had entered 4 bars, C,Am,F,G7, i.e. I, iim, IV, V7 then repeated several times changing key each time, so the next line entered was D,Bm,G,A7 and so on. Standard chord lettering was used on all tests.

Sorry for any confusion.

Regards
Vintage