The best alternatives to Holon are Blocs Wave , Theremin, and Pegboard. If these 3 options don't work for you, we've listed a few more alternatives below.
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Blocs Wave will have you making music in minutes. Slice and chop up exclusive Ampify sounds or easily import your own. Discover and combine sounds across genres, tweak them using beautiful, touchable waveforms, and record sounds to take ideas further.