For slide bass, I think rounds (or Pressurewounds) work better than flats; they seem to vibrate more freely, giving a livelier feel, and they offer a bit of inherent grit that suits the slide vibe.
Using a glass slide keeps things clean-sounding; for more grease, go with a metal one. (You can even repurpose a socket wrench.)
As for which two strings, A, D, or G are best--but tuned in fifths, so you get a power chord (well, double-stop) with the slide flat across both strings (A-E, D-A, G-D, that sort of thing).
And while it's certainly possible to play slide bass on a four-string, the reason Sandman took off two strings was because the extra ones got in the way, according to an interview with him I heard back in the day. Plus, a high action set-up prevents the slide from hitting the fret edges.
It's not too hard to build a slide bass using cigar box guitar building principles, or by modifying a pawn shop find. C.B. Gitty offers a kit: The "G-Bass" 2-string DIY Electric Bass Guitar Kit. And there are also builders, like Krappyguitars and ATLANSIA. I've seen pictures of two-string Sandbergs, too.
Using a glass slide keeps things clean-sounding; for more grease, go with a metal one. (You can even repurpose a socket wrench.)
As for which two strings, A, D, or G are best--but tuned in fifths, so you get a power chord (well, double-stop) with the slide flat across both strings (A-E, D-A, G-D, that sort of thing).
And while it's certainly possible to play slide bass on a four-string, the reason Sandman took off two strings was because the extra ones got in the way, according to an interview with him I heard back in the day. Plus, a high action set-up prevents the slide from hitting the fret edges.
It's not too hard to build a slide bass using cigar box guitar building principles, or by modifying a pawn shop find. C.B. Gitty offers a kit: The "G-Bass" 2-string DIY Electric Bass Guitar Kit. And there are also builders, like Krappyguitars and ATLANSIA. I've seen pictures of two-string Sandbergs, too.