Okay...this is the problem...i've figured out why i cannot play 16th notes (at a normal pace, i don't know the bpm).

It's in my right hand...i'm having trouble tremolo picking as well.

When tremolo picking i always get 2 notes pause 2 notes pause 2 notes etc...

i should play this for example:

12-12-12-12-12-12-12-12-12-----

but i play this:

12-12---12-12---12-12---12-12

i hope you understand me...

i hope someone can give me some advice or good excercises for right hand speed improvement and tremolo picking.

thanks,