Re: Sweeps and such
My 2 cents, I also use this to warm up and in the past it helped me greatly to sweep pick. First mute strings with your left hand and practise to perfect your "rake" using your right hand, falling smoothly from 6th string to 1st string, It is not as easy as it sounds to make a controlled fluid rake with different speeds. Test if it sounds good by playing a full barre chord, let the notes ring together dont worry just perfect your rake for the moment. Watch your pick closely while doing this; which pick/wrist angles you feel comfortable, how much you dig into strings, do you mute strings with your palm, does the pick angle changes as you fall down or you fall with your hand?..etc analyze every detail. Try changing speed and yet keep the same fluidity falling up and down..
When you 'r comfortable with that you can slowly start incorporating left hand rolling/lifting. and find your way to mute the strings(you may notice you r already muting some strings with your right hand so just find your way and optimize it) Interestingly my experience on sweep picking was more like "enlightment", I was practising for long time but I just couldn't do it. Then one day I got a "aha" moment, after that my technique improved very quickly. I believe this rake exercise can give you that "aha" moment