From the amount of the ingredients it apears that the
Hydroquinone solution is given at about the same
concentration as the developer stock but of course it can be
added to the working solution in the amount appropriate to
the dilution.
  Glycin is a warm tone developer for prints. In the
original Agfa/Ansco 130 it results in an active developer
which gives somewhat more neutral image color than Dektol.
However, it is very similar to standard print developers
like Dektol (Kodak D-72). You can get approximately the same
developer by adding 11 grams of Glycin and about 3 grams of
bromide per liter of stock to Dektol.
  Leaving out the Hydroquinone will lower the activity of
the developer considerably. Kodak Selectol Soft and
Agfa/Ansco 120 are print developers with Metol as the sole
developing agent. They are intended to produce lower than
normal contrast on prints. However, since printing paper is
developed to completion the contrast is pretty much fixed by
the emulsion. Film is only partially developed so the
contrast can be varied by adjusting the development. In a
printing paper reducing development to reduce contrast will
generally also reduce the maximum density, which is seldom
desirable. The total variation in contrast available from so
called variable contrast developers has been shown to be no
more than half a grade. These are hangovers from the 1930's
and 1940's when having a choice of paper grade meant having
to stock a box of paper for each grade, which can get
expensive. The variable contrast developer was an attempt to
overcome this through the developer.
  I would never discourage anyone from experimenting but
understand what you are experimenting with and don't be too
disappointed if it doesn't work as advertised.

Beer's print developer is another where a hydroquinone
component is added to vary the contrast. Beer's A is
Ansco 120 at 2/3 the 120's stock strength.

As with Adams' VC A-B 130, Beer's B contains the
hydroquinone. I've worked with Beer's VC developer
and am very incouraged by the results.

My method is to use small solution volumes one-shot.
At present, IIRC, I've at least Beer's 1, 5, and 7
as one-shot stock strengths in one ounce bottles.

Adams' or Beer's, the A solution will work alone
but the B solution will not.

As for 2 baths, I've read of it used where solution
strength varies but not the chemical makeup.

I work only with Graded paper and so take an interest
in VC developers and other whole print contrast
controls. I've no intention of ditching my
very well lite Graded paper not-so-dark
darkroom. Dan