About the technique
The technique itself is really simple; 1st motion is a downstroke of first note (on string any other than first) and the 2nd motion is an upstroke of note on lower string, and sweep of the following note on same string on which your first note was. You might have difficulties with the sweep part, so isolate that particular part and practice it until the notes are clear and their tone full. I suggest you to practice these exercises along with metronome.
Here is a basic exercise to help you overcome this technique:
Implementation
You can implement this technique on any scale you want, and progress your runs on as much strings as you like. For beginning, start from root note, and once you got the technique in your fingers, improvise in all modes you know.
I came up with a couple of interesting runs. Once you learn each individually, you can try and combine them!
I strongly advise you (as I always do), to not take these exercises only as they are. Take your scales and licks and implement! You will be surprised of how exotic it will sound!
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