Good morning Bigfatbass.
I suppose the skill in blues / rock bass is in the groove so that, when I said, "only", I was trying to imply that the material doesn't need need the top-drawer skills of a Jaco or a Wootten or a Hamm.
Even so, and especially in slow blues, the groove and the vocal line can be close together, or miles apart, or anywhere in between at any time. And that complicates matters for me. I was OK with the fretless Precision and singing but the 6 has me floored ... well, at least for the moment. Somehow, I don't seem to be able to transfer the playing / singing skills I honed on the Precision, onto the 6 (both unlined basses).
Like all my musical stuff, I'll just have to muddle through and see how it goes, I guess!
Best.
John