This is the second part of a project concerning variation of stability and
chamber structure for ADHM invariants of curves. Wallcrossing formulas for such
invariants are derived using the theory of stack function Ringel-Hall algebras
constructed by Joyce and the theory of generalized Donaldson-Thomas invariants
of Joyce and Song. Some applications are presented, including strong
rationality for local stable pair invariants of higher genus curves and
comparison with wallcrossing formulas of Kontsevich and Soibelman, and the halo
formula of Denef and Moore.Comment: 32 pages, AMS LaTex; v.2: Thm 1.2 improved; v3: many proofs
simplified based on a remark of Dominic Joyce, results unchanged; v3: 18
pages, shorter version to appear in J Geom Phy
