somebody use cubase 5 ?

hi, i would like to learn how to do some simple modifications on our midifiles for bb
as change velocity or change key etc. somebody can help me how to do? thank very much

p.s. i have cubase 5 and roland sound canvas sc-va but i can’t to be able to work together…
also if i put the track vst i don’t hear nothing from the loudspeakers… thanks