I was not very clear on the lesson I gave everyone. I apologize, and will try make it clearer. To be able to sweep pick you should first learn the positioning of the arpeggio with your fingers. When you fret the notes, you cannot hold two notes and sweep because it will sound horrid. You have to smoothly transition each finger, note to note, without any horrible ringing from the other strings. Try to synchronize this with your picking hand by sweeping (like a broom) the notes. It takes time, but you will surely get it! try this out. This is a basic sweep picking pattern (above) This is what it should sound like when you get it right.