1. A method comprising: based at least in part on an environmental classifier, selecting a sound source model from a plurality of sound source models, wherein each sound source model provides an estimate of a sound signal in at least one of a plurality of acoustic environments, and wherein the environmental classifier is indicative of an acoustic environment in which a microphone receives sound; using the selected sound source model to update a parameter of a filter; processing an input audio signal provided by the microphone to generate an output audio signal, wherein processing the input audio signal comprises filtering the input audio signal with the filter; and causing an output transducer to provide an output that is based on the output audio signal.