[hatari-devel] Improved YM2149 sound

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This patch is for more accurate YM2149 sound. Sounds better also.
Tested ok, specifically on: Decade demo (quartet screen), Madness demo,
Blubber demo, sh11inv demo.

Hunk 1) Fixes a typo of mine.

Hunk 2) Improved YM2149 math model.
Hunk 3) "
Hunk 4) "
Hunk 5) "

Hunk 6) Discard frequencies higher than 80% of nyquist rate.
Hunk 7) "

Hunk 8) DC level correction for high frequencies 'quartet mode'
Hunk 9) "


Attachment: sound.c.quartet.4.diff
Description: Binary data

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