Ghost Instruments ?

Hi,

Can one instrument "ghost" another.

IOW, say I have Instr1 and it has various parameters assigned.

Now I would like to have Instr2 be a "ghost" of Instr1, always tracking any changes made to Instr 1, but outputting to a different actual sound.

Is this possible?     If so, what is the technique to accomplish it.

If not, I suggest it would be a very useful enhancement.

Thanks.