SID experiments

No soup for you :-(
registers
76543210
$d400freqlo1Channel 1 Frequency Low-Byte
$d401freqhi1Channel 1 Frequency High-Byte
$d402pwlo1Channel 1 Pulse Width PW7-0)
$d403pwhi1unusedChannel 1 Pulse Width (PW11-8)
$d404cr1noisepulsesawtritestringsyncgate
$d405
$d406
$d407
$d408
$d409
$d40a
$d40b
$d40c
$d40d
$d40e
$d40f
$d410
$d411
$d412
$d413
$d414
$d415
$d416
$d417
$d418
$d419
$d41a
$d41b
$d41c



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