[CM] accessing data in seq

[M. Perticone]

hello listers,

i need some help or clarification on the following: after importing events,
is there a way to access the data inside #&whatever-track ? just as an
example, what should i do to transpose all :keynumber, or say, to add a
number to each :time ?
excuse me if this is obvious but i couldn't find how to access and modify
existing data in a seq, apart from set!
thanks in advance,
marcelo