1. A method comprising: receiving an electrical signal sensed from a patient, wherein the electrical signal comprises an electromyogram (EMG) signal; receiving an indication of an input indicative of a patient activity; associating at least one biosignal with the input indicative of the patient activity, wherein the at least one biosignal is based on the electrical signal; detecting, from the patient, the at least one biosignal that results from a volitional patient input corresponding to the input indicative of the patient activity; and controlling, by a processor and based on the detection of the at least one biosignal, adjustment of a parameter that at least partially defines therapy delivery to the patient.