Been thinking of trying some Velvet strings but really don't know which one would be best for me. I won't be doing any bowing. Also, how is the tension on these strings compared to guts and spiros? I know they are from one extreme to the next, but are they somewhere between? Love the sound of the guts, but love the tension of the spiros. What about volume too? I play bluegrass, looking for an old sound.Thanks for any help.