ghs compressors are really good although i dont belive they are truly "halfwounds" (the outer wrap is "compressed" or flattened somewhat)
also, alembic makes their strings with an elliptical winding which makes the feel very similar to halfwounds
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DMing 1st Edition Old School....
I'm using SIT PowerFlats (nickel groundwounds) but I'm getting a set of some New D'addario grounds when they come out next month... I've been assured they are a killer string