I used to have an LP this was on, I remember thinking at the time that Gerwig was one of the most convincing lute players around. Then came the later generation (such as the very fine player, Paul O'Dette) who had some other ideas. Listening to it for the first time in several decades, it still strikes me as pretty good. It was as close as we were going to get in the early 70s.
I believe it's the tablature (beginning on page 48 of the pdf) for this piece, though I haven't checked it by retuning my guitar and trying it out. If I get around to trying it out I'll revise.