General purpose parton showers are based on classical branching algorithms. As a result, it is not possible to account for even the leading quantum interference effects in general scattering processes and this often limits the accuracy of these showers to the leading colour approximation. We have developed the CVolver Monte Carlo code, which is able to evolve a density matrix to a prescribed accuracy in colour. This means we are able to account for wide-angle, soft-gluon physics systematically in 1/N where N=3 is the number of colours. This is the first time such a systematic resummation has been performed for general processes and in this talk I will report on the latest results.