NES = 21477270 hz
CLK = NES/12 1789772.5

C5 = 261.625565 Hz

pulse
	11bit period
	F = (CLK / ((period+1)*2)) / 8
	C5 = 426.5605912212745723071825950954
	lowest note: A-2
	8 sample cycle
tri
	11bit period
	F = CLK / (period+1)
	C5 = 213.7490456106372861535912975477
	lowest note: A-1
	32 sample cycle
noise
	4bit period index
	F = CLK / ptab[index]
	notemap:
	C0,B0,B1,E2,B2,E3,B3,D#4,G4,B4,E5,B5,B6,B7,B8,B9 (15..0)
	(period table = 
        4,8,16,32,64,96,128,160,202,254,380,508,762,1016,2034,4068)
	(use search function to find period/noise index)
	(noise)
dpcm
	4bit period index
	F = CLK / ptab[index]
	C5 = 213.7490456106372861535912975477 (index 7)
	NOTES: C4 D4 E4 F4 G4 A4 B4 C5 D5 F5 G5 A5 C6 E6 G6 C7 (0..15)
	(use search function to find period index)
	1bit dpcm
vrc6 pulse
	12bit period
	F = CLK / (period+1)
	C5 = 426.5605912212745723071825950954
	lowest note: A-1
	16 sample cycle
vrc6 saw
	12bit period
	F = CLK / (period+1)
	C5 = 487.64067568145665406535153725188
	lowest note: C-2
	14 sample cycle
n106
	18bit frequency
	F = (f * NES) / (360 * 2^18)
	C5 = 18393.463199067367500618095316584
	highest note: A-8
	16 sample cycle (definable)
vrc7
	16bit frequency
	(must translate into octave/freq setting)
	F = 49772*f / 2^19
	C5 = 2752.0849523349825027150959333896
	highest note: F#9
	? sample cycle (use 32?)
mmc5
	11bit period
	F = CLK / ((period+1)*2)
	C5 = 426.5605912212745723071825950954
	lowest note: A-2
	16 sample cycle
fme07
	12bit period
	F = CLK / (period+1)
	C5 = 426.5605912212745723071825950954
	lowest note: A-1
	16 sample cycle
FDS
	12bit frequency
	F = CLK * FREQ / 65536
	C5 = 613.11543996891225002060317721945
	highest note: G#7
	64 sample cycle