I see what you mean, most likely just a way of referencing the columns of 1, 2, 15 & 16.

The Nemo is more obvious as it has 8vb & 8va rather than +3 & +4  (but no printing above columns 1 & 2).

Cheers

Jean

In ATR mode, I can see the scale note names printed on top of the grid, buttons 3 to 14 inclusive, I also see +1, +2, +3 and +4. The last two bump the notes up or down an octave but the first two appear to do nothing. I've searched through the manual for these numbers and found nothing relevant so what do the first two buttons do and what is the significance of the numbering system? Thanks.