  We analyze the impact of multichannel scattering in harmonic waveguides on
the positions and widths of confinement-induced resonances for both isotropic
and anisotropic transversal confinement. Multichannel scattering amplitudes and
transmission coefficients are calculated and used to characterize the resonant
behaviour of atomic collisions with varying anisotropy. A mechanism is
established which leads to a splitting of the confinement-induced resonance in
the presence of anisotropy.
