A system comprising: a cochlear implant system comprising: a cochlear electrode ; a stimulator in electrical communication with the cochlear electrode ; an input source configured to receive a stimulus and generate an input signal representative of the received stimulus, wherein the received stimulus is representative of an external acoustic signal; a signal processor in communication with the stimulator and the input source , the signal processor being programmed with a transfer function and being configured to receive one or more input signals from the input source and output a stimulation signal to the stimulator based on the received one or more input signals and the transfer function; and an implantable battery and/or communication module in communication with the signal processor and being configured to provide electrical power to the signal processor ; and the cochlear implant system is configured to: receive a status indicator signal indicative of whether an external auditory aid device is active; and update the transfer function of the signal processor to compensate for operation of the external auditory aid device if the external auditory aid device is active. a cochlear implant system comprising: a cochlear electrode ; a stimulator in electrical communication with the cochlear electrode ; an input source configured to receive a stimulus and generate an input signal representative of the received stimulus, wherein the received stimulus is representative of an external acoustic signal; a signal processor in communication with the stimulator and the input source , the signal processor being programmed with a transfer function and being configured to receive one or more input signals from the input source and output a stimulation signal to the stimulator based on the received one or more input signals and the transfer function; and an implantable battery and/or communication module in communication with the signal processor and being configured to provide electrical power to the signal processor ; and a cochlear electrode ; a stimulator in electrical communication with the cochlear electrode ; an input source configured to receive a stimulus and generate an input signal representative of the received stimulus, wherein the received stimulus is representative of an external acoustic signal; a signal processor in communication with the stimulator and the input source , the signal processor being programmed with a transfer function and being configured to receive one or more input signals from the input source and output a stimulation signal to the stimulator based on the received one or more input signals and the transfer function; and an implantable battery and/or communication module in communication with the signal processor and being configured to provide electrical power to the signal processor ; and the cochlear implant system is configured to: receive a status indicator signal indicative of whether an external auditory aid device is active; and update the transfer function of the signal processor to compensate for operation of the external auditory aid device if the external auditory aid device is active. receive a status indicator signal indicative of whether an external auditory aid device is active; and update the transfer function of the signal processor to compensate for operation of the external auditory aid device if the external auditory aid device is active. <EOS>