An apparatus for use in treating a neurological disorder of the auditory system, comprising a sound processing unit; an audio stimulation unit and a somatosensory stimulation unit; wherein said sound processing unit comprises: a processor operable to analyse an audio signal, the audio signal comprising a first component comprising a broadband or white noise component and a second component comprising a plurality of tone bursts of periods between 2ms and 500ms with frequencies covering a critical band of hearing in the range 500Hz and 16 kHz and to spectrally modify the audio signal to generate a modified audio signal and a plurality of actuation signals therefrom representative of said audio signal; and wherein said somatosensory stimulation unit comprises: an array of stimulators each of which can be independently actuated to apply a somatosensory stimulation to a subject, and an input for receiving the plurality of actuation signals from said sound processing unit and directing individual actuation signals in a predetermined pattern to individual stimulators in the array; and wherein said audio stimulation unit comprises an input for receiving said modified audio signal from the sound processing unit and an output for delivering an audio stimulation to the subject, the modified audio signal comprising a plurality of tone bursts of periods between 2ms and 500ms with frequencies covering a critical band of hearing in the range 500Hz and 16 kHz. a processor operable to analyse an audio signal, the audio signal comprising a first component comprising a broadband or white noise component and a second component comprising a plurality of tone bursts of periods between 2ms and 500ms with frequencies covering a critical band of hearing in the range 500Hz and 16 kHz and to spectrally modify the audio signal to generate a modified audio signal and a plurality of actuation signals therefrom representative of said audio signal; and wherein said somatosensory stimulation unit comprises: an array of stimulators each of which can be independently actuated to apply a somatosensory stimulation to a subject, and an input for receiving the plurality of actuation signals from said sound processing unit and directing individual actuation signals in a predetermined pattern to individual stimulators in the array; and wherein said audio stimulation unit comprises an input for receiving said modified audio signal from the sound processing unit and an output for delivering an audio stimulation to the subject, the modified audio signal comprising a plurality of tone bursts of periods between 2ms and 500ms with frequencies covering a critical band of hearing in the range 500Hz and 16 kHz. an array of stimulators each of which can be independently actuated to apply a somatosensory stimulation to a subject, and an input for receiving the plurality of actuation signals from said sound processing unit and directing individual actuation signals in a predetermined pattern to individual stimulators in the array; and wherein said audio stimulation unit comprises an input for receiving said modified audio signal from the sound processing unit and an output for delivering an audio stimulation to the subject, the modified audio signal comprising a plurality of tone bursts of periods between 2ms and 500ms with frequencies covering a critical band of hearing in the range 500Hz and 16 kHz.