Two tools on a lathe-programming problem

I was asked to help convert a large hydrauilc tracer lathe to CNC. This
is a wood turing machine that generally makes things like porch column-
up to 10 ft long.

The basice machine would be a simple project, BUT there is one item I
cannot figure out. It has one carriage driven by a servo motor, but it
carries TWO cross slides. The slides are about 6 " apart. In tracer use
the leading cross slide carries a rough cut tool, the following one
carries a finish tool. In one pass (remember, 10 FEET long) two cuts are
taken.

It would be simple to put a motor on each cross slide, but how would I
code it? There is only one controllable Z axis. At any particular spot
the two X slides need to be in different places. If I could build some
kind of 'delay line' I could delay all the x steps by the right ammount,
but that seems tricky.

Is there any software that does this? I understand there are commercial
CNC lathes sold that can do this.

Fred, can Vector do this?

ron ginger