A system includes a sound processor included in an electro-acoustic stimulation (“EAS”) device and that directs a cochlear implant to apply electrical stimulation to a patient and a receiver to apply acoustic stimulation to the patient. The system further includes a volume control facility and a selection facility that selectively associates the volume control facility with the electrical stimulation in response to a first user input, selectively associates the volume control facility with the acoustic stimulation in response to a second user input, and selectively associates the volume control facility with both the electrical stimulation and the acoustic stimulation in response to a third user input.