Yes, you can. I'm not sure of the Rock Band 1 instruments, but Rock Band 2 instruments for sure...
no.... sry! D:
probably not
You can play band hero instruments with rock band 2.
yes
Of course - yo caneven use guitar hero-instruments
Noo different game different controls
yes.sure
yes they will but you will not be able to use the pro modes with the old controllers
you should be able to
Yes
no, sorry