Think I may have been half asleep before...

Get out your instrument and check this on the keyboard and buttons...

Well now

looking a the button side, they run up...

Buttons --> C [G] D [A] E is thus I [V] II [VI] III

and down (in reversre of the previous example)

C [F] Bb {Eb] Ab   ie I [IVb] 7b [IIIb] 6b

b = the flattened note


Starting all these examples from C in C Major

V + V = II

Major Scale of C - C -> G -> D - the 2nd


and IV + IV = VII

if you take two IV (steps to the left) from C on the bass buttons you actually end up with Bb which is VIIb

Confused yet?

:-)

Remember, if you place your middle finger on C, the ring finger is on IV and the index finger is on V - you can fake it well enough so that you don't need the V7 ACTUAL chord - which is two buttons along the short line

they run

Counter bass
Bass
Major
Minor
Major Seventh


Robin