Part of my job is to teach a variety of guitar techniques, which means I have to learn them as well, at least a little bit… so I have a vague idea of what I am talking about! But I absolutely hate doing “exercises”, so what I usually do is create a mini piece of music that uses the technique and that sounds nice (to me).
(Well, at least I like to call it “piece of music”, not sure about my neighbours and loved ones… especially after recording attempt number 99).
As most of us probably know, “economy picking” or “Gambale sweeping” was made popular in a rock/fusion context by… the great Frank Gambale of course! He may not have been the first one to use (at least part of) this technique but he was certainly the first one to “codify it” and teach it systematically.
I think the technique lends itself very well to cool-sounding mixes of scales and arpeggios, like the 9th thingies I am using here. The main challenge for me has always been to mix alternate and sweeping in a smooth way, trying to minimize the (inevitable?) timing irregularities at the junctures. I find the 9th arps to be a lot easier, in this respect, compared to your standard 3nps scales. Therefore, I think they may be a better starting point to get into this kind of playing (easy wins, remember?).
Etude:
Micro-lesson: