Hi all. Now i know exactly what you are talking about, that nasty noise you hear in 1st @ 1.8-2.1k rpm and 2nd @~2k rpm.
I drive in NYC and here its allways a red light, stop sing or everyday traffic that will make you start all over again and again and again.......So after 12k miles like that ive learned that when that noise come up its when you depress your clutch the WRONG WAY.
Its weird when you depress it you need to hold it just a sec when it engages(in order to have a smooth/aligned engagement) then continue letting it go, this way i found no rattle noise.
All i can say now is good luck w/ the practice cuz youll have to get it right all the time.
If after practice you still cant get it right then tune up ur radio.