I'm thinking about buying a Washburn 8-string bass that is insanely discounted at our local Mars. So it is the usual 8-string configuration: the standard E,A,D,G bass strings on it and each bass string is doubled with a smaller string one octave higher. My question is, what exactly are those high strings? Are they just electric guitar strings, or are they special strings made only for this kind of bass? Also, anybody play one of these? Any tips you'd care to share?