Change history of «Shepard-Risset glissando»

α	β	date	comment
		01 Nov'20 08:26
		01 Nov'20 19:27	off by one error
		02 Nov'20 07:00	clean up code
		02 Nov'20 07:03
		02 Nov'20 07:10
		02 Nov'20 07:12
		02 Nov'20 07:12
		02 Nov'20 16:48
		02 Nov'20 17:06