English Jon - Minor scales are easily negosiated if you just use the main bass note button above the button of the key you are playing Eg

E bass note - E minor Chord - B bass note (above the E)

By repeating this you can accompany most minor tunes, but unfortuatly this tecqunic does not really use the counter bass, but is useful to know.

I hope you can make sence of this as it is quite hard to describe.

Cheers, Sam