Deformations of gauged WZW actions are constructed for any pair (G,H) by
taking different embeddings of the gauge group HβG as it acts on the
left and right of the group element g. This leads to models that are dual to
each other, generalizing the axial/vector duality of the two dimensional black
hole manifold. The classical equations are completely solved for any pair
(G,H) and in particular for the anti de Sitter string based on SO(dβ1,2)/SO(dβ1,1) for which the normal modes are determined. Duality is
demonstrated for models that have the same set of normal modes. Concentrating
on SO(2,2)/SO(2,1), the metric and dilaton fields of the d=3 string as well
as some of the dual generalizations are obtained. They have curvature
singularities and represent new singular solutions of Einstein's general
relativity in three dimensions.Comment: 17 page