Most electromechanical and electronic organs hire subtractive synthesis, as do pipe organs. Alerts rich in harmonic partials (including sawtooth waves) are selected because of the performer within the keyboard and merged and formed acoustically by filter circuits that simulate the formant, or resonant-frequency, spectra—i. William Basinski’s extended perform Disintegration Loops https://www.youtube.com/watch?v=JAf6bAiJCs0