Nice, I was thinking about one of those recently, but opted to get a steel guitar (instead of the brass one
). They have a really warm sound for a resonator. They have a nice size, too. My only complaint when playing one was the 12th fret neck join, but that’s a small complaint. I don’t spend too much time up that high on the acoustic’s neck.
Brass/steel/glass/bone/plastic slides all sound different. If I wasn’t so much of a klutz, I’d probably use a glass one more often, but all of my non-metal slides seem to lead short, brutal lives. The harder materials normally cause less noise from drag when you move it on the strings, and the hardness of the material changes the tone a lot. Even the brass and chrome slides I have sound slightly different from one another. Pvc and bone have their own, kind of honky, muted sound (kind of like a muted trumpet). I’ll try to use just about anything I can stick my finger in and make a
That said, I keep returning to the same $10 brass Dunlop slide that I bought when I was a teenager, or one of the replacements I bought when it was mislaid. Electric or acoustic, it just sounds right to me, and I’m faster with it than with a heavier slide.
Heavier strings will deflect a lot less when playing with a slide, and allow you to press the slide harder against the strings when you want to. Most of my preference for heavier strings is just that, a preference. In the case of slide guitar, it really does make it easier to play the thing. The easiest guitar I have to play slide on is an electric 12 string. The resistance of all the strings allows you to have it set with normal electric guitar action, but still really go to town on slide without banging the frets. The other option is put super lights on it, and tune up to open A. High string tension works in your favor on slide.
Other than that, the only real advice I have on how to play slide is: Once you learn a riff in an open G/A style tuning, you can play that riff one string further to the bass side when you’re in an open E/D style tuning (of course, you’ve transposed the key).
Oh, and try a thumb pick. Having the extra fingers available for picking and muting is the best thing since sliced bread.