Xpantastic!

Hi all,
I've been wrangling with my Xpander for some months now, and still
only feel vaguely comfortable when trying to implement the lag and
tracking generators (i.e. I actually know what they are doing!)

Starting with the Lag G, my biggest source of confusion is that lag
can be added on page 2 (to the oscs or filter for example), it can be
added as a mod source, and then it has its own input on the Lag G
page...  

I can't figure out how the input affects the lag when it is then used
as a mod source elsewhere.  E.g. if you make LFO1 the INPUT, what
should I expect the result to be on the lag when assigned elsewhere?

And does the lag INPUT affect the oscs/filter page 2 lag parameter?

As for the tracking generator, I guess the same question applies-how
does what is placed as INPUT affect the TG when it is used as a mod
elsewhere?  

The function of these has been the hardest aspect of this synth to
grasp and it is when you start using TG 1 as an INPUT to TG 1 (for
example), that I really have no idea what's going on!

Can anyone give me some basic pointers?