SN76496 revision history
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V1.6.6 - 2024-03-10 (FluBBa)
	Added support for internal oversampling.
	Fixed calling of all functions from C.
	Small optimization to calculateVolume.

V1.6.5 - 2021-11-24 (FluBBa)
	Changed noise feedback to a member of the struct.

V1.6.0 - 2021-03-05 (FluBBa)
	Added load/save state.

V1.5.0 - 2020-08-09 (FluBBa)
	Rewrote mixer to use attenuation LUT from bits.

V1.4.1 - 2020-06-05 (FluBBa)
	Fixed up headers and more.

V1.4.0 - 2018-07-13 (FluBBa)
	16Bit mono version.
	Optimised register writes.

V1.3.0 - 2018-06-19 (FluBBa)
	Built in 4x down sample.

V1.2.1 - 2016-07-31 (FluBBa)
	Changed to unified assembler style.

V1.2.0 - 2015-04-26 (FluBBa)
	Optimised mixer and volume writes.
	Refactored variable and function names.

V1.1.0 - 2015-03-07 (FluBBa)
	SN76496, fixed phase reset when setting volume.
	Changed SN76496 to emulate per cycle and downsample afterwards.
	Fixed selection of SMS/SG-1000 for the SN76496 sound chip.

V1.0.0 - 2009-08-25 (FluBBa)
	First version.

