I have been working out of a site reading book of cello studies. The studies actually have notation for the low c and low d on the B string. So I was looking at affordable 5 strings but got a great deal on a used Carvin 6 string. Great instrument. Anyone have any suggestions for material that would cover the extended range. I typically try to work on arrpeggios in different key signature, site reading and time studies. So I am applying those ides on an extendeed range. Just wondering if anyone had any suggestions? I am thinking about the Bach studies for electric bass.