I have a fretless 6 string that I like to set up EADGCF. Where can I go to get a set of strings? Do I have to buy a 7 string set and ditch the B? This instrument is an electro-acoustic set up with a Piezo pup, so I don't have to have metalic strings. Scale is 35". Any suggestions for type of strings (I want as close to DB sound as I can get). thanks!