RecruitingBehavioural interventionEffects of RAS on Gait in PD Patients With DBSParticipants will be asked to walk along with the metronome beats (RAS) during the participants' stimulation state (ON or OFF) for four minutes for each state. The researcher will collect the gait parameters (cadence, velocity, and stride length) of patients before, during, and after RAS in both DBS ON and OFF states. Using MDS-UPDRS, participants' gait patterns will be collected before and after RAS while both DBS is ON and OFF. Electrophysiological activity (local field potentials, LFPs) will be collected across all stages (pre, during, and post-RAS) of evaluation.