[quote name='Hector' timestamp='1333884580' post='1607685']
Hey Matt. I'm far from expert at this technique but I'd say the thing to keep most in mind is that to play fast you have to practise slow. Be really honest with yourself and take things right down to a very slow tempo and be as accurate as possible before you speed up. It will come with patience but only out of very accurate technique that comes from taking it really slow.
As for order of thumb/fingers, I'd say that you need to find whatever works for you. Personally, I agree with Chris 2112 - keep a strict order of thumb, index, middle, ring when a line is continuous. However, use your head a bit with where you start with the thumb, as sometimes it's useful to reset the pattern (e.g. playing 3 note patterns across 3 strings quickly it makes sense to use thumb, index, middle for speed).
One thing I found really useful for this technique was to do string cross/right hand exercises with every combination of two fingers from thumb index middle and ring separately. So I would play the same exercise with strict alternation of thumb and index, then thumb and middle, then thumb and ring, then index and middle, index and ring, then middle and ring.
Sadly, my 4 finger technique has long since fallen at the wayside due to my upright playing - I hardly play electric bass any more except for sessions/gigs that require it.
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Thanks for all the tips. Yeah I've been practicing slowly, could probably do with going even slower though. I've started practicing my scales to hip hop drum loops too, just to make things a bit more interesting haha. Thanks again boys, I'll let you know how I get on!