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Quarter tone - Wikipedia
Quarter-tone Piano Prelude #4 - YouTube
Buy Korg PA700 Oriental Quarter Tone 61 Key Arranger | Sam Ash Music
Achieving simple quarter tones in Eurorack - MOD WIGGLER
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New design for the quarter-tone piano unveiled in Finland
Tonality and Microtonality & How can we inspire its exploration in Electronic Music and Modular Synthesis? — Parts 1 , 2, and 3 | by Geoffrey Smith | Medium
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New design for the quarter-tone piano unveiled in Finland
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