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Four such phonatory mechanisms\u2014undertone, distortion, growl, and rattle\u2014differ in supraglottic involvement and frequency ratio between glottal and supraglottic oscillators. However, the contribution of vocal tract (VT) configurations remains insufficiently understood. Using static three-dimensional magnetic resonance imaging and acoustic analysis, we investigated VT shaping in a professional singer. The VT was used to calculate volume\u2013velocity transfer functions and was segmented into seven sub-volumes for geometric analysis. Acoustic recordings provided fundamental frequencies and pitches. Undertone and distortion showed the most speech-like configurations, with ventricular and epilaryngeal volumes largely unaffected by the laryngeal elevation. Growl involved laryngeal lowering and tongue retraction, facilitating epiglottic\u2013arytenoid approximation. Rattle exhibited increased pharyngeal constriction. Growl showed clustering of resonance peaks around 2000\u20134000\u2009Hz (singer's formant region), and high rattle showed alignment of twice the pitch with the first resonance frequency, suggesting an enhanced source\u2013filter interaction. For this singer, the VT configuration differed systematically across the four phonatory mechanisms. These hypothesis-generating observations underline the potential role of VT configuration of nonlinearities in phonation and motivate larger studies relevant to voice pedagogy and clinical practice involving supraglottic sound production.<\/jats:p>","DOI":"10.1121\/10.0044898","type":"journal-article","created":{"date-parts":[[2026,8,21]],"date-time":"2026-08-21T16:22:56Z","timestamp":1787329376000},"page":"1733-1744","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Vocal tract configuration and acoustic transfer characteristics in mechanisms of extreme vocal styles\u2014A pilot study"],"prefix":"10.1121","volume":"160","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5747-7967","authenticated-orcid":false,"given":"Louisa","family":"Traser","sequence":"first","affiliation":[{"name":"Institute of Musicians' Medicine, Medical Center, University of Freiburg 1 , 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Freiburg,","place":["Germany"]},{"name":"Department of Radiology, Medical Center, Medical Physics, University of Freiburg 4 , Freiburg,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9720-3506","authenticated-orcid":false,"given":"Michael","family":"Bock","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, University of Freiburg 2 , Freiburg,","place":["Germany"]},{"name":"Department of Radiology, Medical Center, Medical Physics, University of Freiburg 4 , Freiburg,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0414-7889","authenticated-orcid":false,"given":"Hanspeter","family":"Herzel","sequence":"additional","affiliation":[{"name":"Institute for Theoretical Biology, Charit\u00e9 \u2013 Universit\u00e4tsmedizin Berlin and Humboldt-Universit\u00e4t 5 , 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Freiburg,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0095-5360","authenticated-orcid":false,"given":"Matthias","family":"Echternach","sequence":"additional","affiliation":[{"name":"Department of Otorhinolaryngology, Ludwig-Maximilians-Universit\u00e4t M\u00fcnchen, Division of Phoniatrics and Pediatric Audiology, LMU Klinikum 7 , Munich,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6186-8298","authenticated-orcid":false,"given":"Mario","family":"Fleischer","sequence":"additional","affiliation":[{"name":"Department of Audiology and Phoniatrics, Charit\u00e9 \u2013 Universit\u00e4tsmedizin Berlin, Corporate Member of Freie Universit\u00e4t Berlin and Humboldt-Universit\u00e4t zu Berlin 6 , 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