I did a little looking up on what string types fall in between Roundwounds and flatwounds, and came up with two types:
groundwounds and halfrounds.
That's about all the information I got. I couldn't find any info about the characteristics of these types, or what brands are recommended, etc.
I'm looking for something to put on a new P bass, with the richness of flats but enough life for some possible slap. Some smoothness but not dead. I demand middle-ground!
What brands have you had experience with? These seem like fairly uncommon strings for most bassists, yet seem like they may be exactly what I want.