A system comprising: a sound processor (304; 1004; 1302-1; 1302-2) included in an electro-acoustic stimulation ("EAS") device (302, 1202-1, 1202-2) and configured to direct a cochlear implant (110; 1310-1, 1310-2) to apply electrical stimulation to a patient, the electrical stimulation representative of audio content included in a first frequency band, and direct a receiver to apply acoustic stimulation to the patient, the acoustic stimulation representative of audio content included in a second frequency band; a volume control facility (306, 804, 1002, 1102, 1304) communicatively coupled to the sound processor; and a selection facility (602, 806, 1004, 1318) communicatively coupled to the volume control facility and configured to selectively associate the volume control facility with the electrical stimulation in response to a first user input, and selectively associate the volume control facility with the acoustic stimulation in response to a second user input; wherein the volume control facility is configured to adjust, in response to actuation of the volume control facility by a user while the volume control facility is associated with the electrical stimulation, a first volume level perceived by the patient when the electrical stimulation is applied by the cochlear implant, and adjust, in response to actuation of the volume control facility by the user while the volume control facility is associated with the acoustic stimulation, a second volume level perceived by the patient when the acoustic stimulation is applied by the receiver; characterized in that the selection facility is configured to selectively associate the volume control facility with both the electrical stimulation and the acoustic stimulation in response to a third user input; and the volume control facility is configured to adjust, in response to actuation of the volume control facility by a user while the volume control facility is associated with both the electrical stimulation and the acoustic stimulation, an overall volume level perceived by the patient when either the electrical stimulation is applied by the cochlear implant or the acoustic stimulation is applied by the receiver. a sound processor (304; 1004; 1302-1; 1302-2) included in an electro-acoustic stimulation ("EAS") device (302, 1202-1, 1202-2) and configured to direct a cochlear implant (110; 1310-1, 1310-2) to apply electrical stimulation to a patient, the electrical stimulation representative of audio content included in a first frequency band, and direct a receiver to apply acoustic stimulation to the patient, the acoustic stimulation representative of audio content included in a second frequency band; direct a cochlear implant (110; 1310-1, 1310-2) to apply electrical stimulation to a patient, the electrical stimulation representative of audio content included in a first frequency band, and direct a receiver to apply acoustic stimulation to the patient, the acoustic stimulation representative of audio content included in a second frequency band; a volume control facility (306, 804, 1002, 1102, 1304) communicatively coupled to the sound processor; and a selection facility (602, 806, 1004, 1318) communicatively coupled to the volume control facility and configured to selectively associate the volume control facility with the electrical stimulation in response to a first user input, and selectively associate the volume control facility with the acoustic stimulation in response to a second user input; selectively associate the volume control facility with the electrical stimulation in response to a first user input, and selectively associate the volume control facility with the acoustic stimulation in response to a second user input; wherein the volume control facility is configured to adjust, in response to actuation of the volume control facility by a user while the volume control facility is associated with the electrical stimulation, a first volume level perceived by the patient when the electrical stimulation is applied by the cochlear implant, and adjust, in response to actuation of the volume control facility by the user while the volume control facility is associated with the acoustic stimulation, a second volume level perceived by the patient when the acoustic stimulation is applied by the receiver; adjust, in response to actuation of the volume control facility by a user while the volume control facility is associated with the electrical stimulation, a first volume level perceived by the patient when the electrical stimulation is applied by the cochlear implant, and adjust, in response to actuation of the volume control facility by the user while the volume control facility is associated with the acoustic stimulation, a second volume level perceived by the patient when the acoustic stimulation is applied by the receiver; characterized in that the selection facility is configured to selectively associate the volume control facility with both the electrical stimulation and the acoustic stimulation in response to a third user input; and the volume control facility is configured to adjust, in response to actuation of the volume control facility by a user while the volume control facility is associated with both the electrical stimulation and the acoustic stimulation, an overall volume level perceived by the patient when either the electrical stimulation is applied by the cochlear implant or the acoustic stimulation is applied by the receiver.