On January 23, 1991, I got a strange craving to experiment with the Hammond T-222 that I had recently bought and my old upright piano. I got an even bigger craving to record these experiments.
The experiment with the Hammond mainly exploit the pulsations that occur when two or more chromatic notes are played together and also abuse the reverb springs.
The experiments with the piano were created by using two pencils and a violin bow on the strings of the piano. The keys were not played at all in this experiment.
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