We conducted a perception experiment using organ chords recorded with 6 microphones and mixed in stereo and binaural, varying in maximum angle distribution (0º, 87º, 174º), and for binaural mixes, varying in elevation, front-rear distribution, and postprocessing. N=51 participants (audio-related students) listened to the 20 stimuli with headphones, classified them according to similarity, and rated their valence and immersion. Results show a high agreement on similarity (Cronbach’s alpha=.93) but very low agreement on valence and immersion ratings. The parameters that were perceived are the difference binaural/stereo, the binaural postprocessing style, and in a lesser degree, the angle. Elevation and rear distribution of sources did not yield any significant response.
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