Visual Reinforcement Audiometry IntelligentVRA has three integrated and flexible test routines in a single system. It also includes built-in safety procedures to keep the test objective: Test routines include: CAST algorithm for fast screening. OHTA interleaved four-frequency test. Standard VRA sequential four-frequency test. Software features: Automated or manual testing. Training sessions before test. Probe and Control trials as reliability measures. Customizable parameters for full control of the test. Choose toy cabinets or video reinforcers.