Assuming that your guitar is tuned to the standard intervals between strings, it's not that difficult to get the scales for 7-string. If you use the following diagrams as an example you will be able to construct them from 6-string scales:
Code:
6-string, minor harmonic scale, 12th position:
e|------------------------------------------12-14-15-|
B|---------------------------------12-13-15----------|
G|------------------------11-12-14-------------------|
D|------------------12-14----------------------------|
A|----------12-14-15---------------------------------|
E|-12-14-15------------------------------------------|
7-string, minor harmonic scale, 12th position:
e |---------------------------------------------------12-14-15-|
b |------------------------------------------12-14-15----------|
F#|---------------------------------13-14-16-------------------|
D |------------------------11-12-14----------------------------|
A |------------------12-14-------------------------------------|
E |----------12-14-15------------------------------------------|
B |-12-14-15---------------------------------------------------|
Of course, these two examples are in different keys, it's just easier this way to show what happens to the tab under the transformation from 6 to 7 strings.
So, in the same key as the 6-string scale, follow these four steps to get your 7-string scale:
1. Have your 6-string scale in front of you in the same format as the example above.
2. Shift the 2nd string of the 6-string tab up one fret (ie add one to the tab).
3. Copy the 5th string tab of the 6-string scale and paste it as the 1st string line of tab for the 7-string scale.
4. Shift this newly formed 7-string scale up 5 frets.
I hope that isn't too confusing, but it should help.
audigital
