This paper outlines a process for achieving and perceptually evaluating a head-tracked binaural audio system designed to enhance realism for players of digital pianos. Using an Ambisonic microphone to sample an acoustic piano, followed by leveraging off-the-shelf equipment, the system allows players to experience changes in the sound field in real-time as they rotate their heads while wearing headphones under three degrees of freedom (3DoF). The evaluation criteria included spatial clarity, spectral clarity, envelopment, and preference. These criteria were assessed across three different listening systems: stereo speakers, stereo headphones, and head-tracked binaural audio. Results showed a strong preference for the head-tracked binaural audio system, with players noting significantly greater realism and immersion.
